GalaxyClass's Correct Answers

You may need to wait for an update or you could also start in Safe Mode and locate any bad app that is locking out that LED.  Follow link :   Power the Device Up in Safe Mode Samsung Galaxy S 5 | Verizon Wireless    Hope this helps.  

The S5 touch screen works by capacitive touchscreen and not resistive touchscreen. Capacitive touchscreen displays rely on the electrical properties of the human body to detect when and where on a display the user touches. Because of this, capacitive displays can only work as normal when dry and be controlled with very light touches of a dry finger and generally but not always cannot be used with a mechanical stylus or a gloved hand.

This will clear the cache partition on your phone and give you a clean reset to stop the cool down mode. This will not delete any information from your device. Do  the steps below listed below if you have not already tried this 1. Power up the phone by pressing the VOL UP + VOL DOWN KEY together + POWER KEY . 2. The device will enumerate with different BOOT OPTIONS 3. Use the VOL DOWN Key to SCROLL and VOL UP Key to SELECT 4. Select Recovery 5. The device will start up with Motorola logo and power up to a little Android man logo with Exclamation mark 6. Press the VOL UP and VOL DOWN Key together at this screen 7. The device will display BLUE Text on a Black background . 8. Use the VOL DOWN Key to scroll DOWN and the POWER Key to SELECT the option desired . 9. In this case , press the VOL DOWN key till the cache partition wipe is selected and press the POWER key to confirm the selection . 10. Use the VOL DOWN key again to select YES - delete all user data and press the POWER key to CONFIRM . 11. The device will then start performing the partition wipe 12. Once the Formatting is complete , press the POWER key to confirm a REBOOT 13. The message rebooting is displayed on the phone. 14. The device will reboot and start the normal power up sequence . If you're still having the issue after this the next troubleshooting I can suggest is to perform factory reset. You can follow the instructions on how to reset your phone here https://motorola-global-portal.custhelp....

Go back into settings and  to Wi-fi. press the three bars in upper right screen. Go to Advanced and uncheck "Always allow scanning", and uncheck Wi-Fi notifications.  Also under Keep wi-fi on during sleep, check "only when plugged in" . This will save your battery from the scanning drain.

Try doing a "Wipe cache partition" Power off your Samsung Galaxy S5 by long pressing the Power On/ Off button. Wait until the device is completely shut down. Now you have to press the following keys at the same time to turn on the phone again: Power On / Off Volume up Home button If the Samsung Galaxy S5 vibrates once, release the power on/ off button, but keep the other two keys from the key combination pressed until a menu appears on the display. Mark the entry "Wipe cache partition" with the volume down key. With the power on / off button, the entry can be selected and the process will start. This usually takes only a few seconds. Then the previously displayed menu appears again. Now select the first entry "Reboot system now" and run the command again with pressing the power button. Your Samsung Galaxy S5 will now reboot. If this does not help, you will then need to do a factory data reset on your Samsung S5 .

From your posting your phone is bootlooping and it's very hard to save and fully recover a phone from a bootlooping condition. But I'm posting you  information to  help you recover this phone. I wish you good luck     Press the Power button then select Power  off. If the device doesn't respond to input, press and  hold the Volume Up/Down then press and hold Power button. When the device screen goes blank release the Power button while continuing to hold Volume  Up/Down, proceed with step 3. Press and hold the Volume Up/Down then press the Power  button. When presented with the Boot Mode Selection Menu release all  buttons. Press Volume Down to select Recovery  then press Volume Up. From the Droid triage screen, simultaneously press Volume  Up/Down. Select wipe data /Factory Reset then press the Power button. Use Volume keys to navigate  options. Select Yes -- delete all user data then press the Power  button. Use Volume keys to navigate options. Data wipe may take several moments. Select reboot system now then press the Power  button. Use Volume keys to navigate your options.

As I said you have made the correct moves to solve this and I feel as I stated,  hardware issue to consider and interface inpur in the circuit. Do you have warranty or insurance to cover a replacement as this would be your move now.     

Verizon does not lock 4G LTE devices, and no code is needed to program them for use with another carrier. However “unlocking” a device will not necessarily make a device interoperable with other networks – a device designed for one network is not made technologically compatible with another network merely by “unlocking” it.  Additionally, unlocking a device may enable some functionality of the device but not all, an unlocked device may support voice services but not data services when activated on a different network).This S5 will not operate on the T mobile GSM system as normal.    sorry , Galaxy Class

First start by doing a System cache clear and than to step two below: Wipe Cache Partition - Samsung Galaxy S® 5 Performing a wipe cache partition removes any temporary files that may be causing an issue with the device. All personal files and settings are not affected by this option. Ensure the device is powered off. If the device doesn't respond to input, remove then re-insert the battery. Press and hold the Volume Up button (located on the left edge near the top) and the Home button (located at the bottom in the middle). While continuing to hold the Home and Volume Up buttons, press and hold the Power button (located on the right edge) until 'RECOVERY BOOTING' appears in the upper left then release all buttons. Select wipe cache partition. Utilize the Volume Up/Down buttons to highlight and the Power button to select. Select reboot system now. Option is highlighted, utilize the Power button to select. -------------------------------------------------------------------------------------------------------------------------------------------------------- Now procede to step two:     Reset All Settings - Samsung Galaxy S® 5 [Device-Specific Instructions] Restoring your device to default settings helps when the device crashes and resets itself or when apps freeze/hang or reset the device. Our Troubleshooting Assistant can help you with other device issues if you aren't currently using the tool. Performing these steps resets all system settings (e.g. ringtones, sound settings, display settings, etc.) back to their default values. Personal data such as downloaded apps and media (pictures, videos, music) are not affected. From a Home screen, tap Apps (located in the lower right). These instructions apply to Standard mode only. Tap Settings. Tap Backup and reset. Tap Reset settings. Tap Reset settings. From the Warning prompt, tap OK to confir You may still have some minor problems for 2 to 3 days, but as the system settles down your minor issues should go away.   Added: Software Update Software Upgrade Assistant (Samsung) | Verizon Wireless

To Disable Visual Voice Mail Sign in to your My Verizon online account. On left side of page find the drop down menu. Click to open menu, then go to change features and locate Basic Visual Voice mail. Locate the button Basic Visual Voice Mail and click the Red Remove Box. Scroll down until you see the listing: Basic Voice Mail, Visual Voice Mail etc. and click the Red Add box by Basic Voice Mail to add on this service. When you're done making changes click next at the bottom of the screen and then ok. Go into your device and set up your required Basic voice mail program. You may continue to receive an  error  message “new voice mail update" for a period of time”.   Hope this helps, GalaxyClass  

The S5 is rated IP67 certified - dust and water resistant - Water resistant up to 1 meter and 30 minutes with no temp specs per say given. However most any smartphone on the market today will operate over a fairly wide range of temperatures that would be suitable for humans over a short given period of time. The phones are to a point self-surviving because of sensors that are built in both for high and low temp, voltage cut-off, thermal run away and many other considerations. Before fail points can be reach the screen will go dark or the phone will shut down and these are but a small example. Samsung Galaxy S5 full specs