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Thanks in advance for any help.

I have a samsung stratosphere which frequently (several times a minute) crashes and reboots without me touching the power button.  From searching the google this seems common, but no fixes have worked for me.

The dets:  I am out of warranty and months away from an upgrade.

               I have factory reset the phone 5 times already.

               I have not rooted my phone.

               I did not download any apps before the issue arose.

               Taking the SD card out usually lets my phone boot up, but one I try opening any apps, it crashes.

So my question is....what is wrong and how do I fix it?

Thanks again!