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Re: Cell phone connects then drops wifi.

jav6
Sr. Member

What OS are your phones running?  There was a discussion on WiFi issues 'obtaining IP address' where a possible solution was described relating to IP assignment via DHCP:

Android Marshmallow (6.0.1) has a common issue with unreliable WiFi connections. If you find that your phone gets stuck “Obtaining IP Address” here’s how to fix it. You may have tried “forgetting” the network, rebooting your router, resetting your phone - all to no avail. The issue is with the DHCP client (software that negotiates IP addresses) new to Marshmallow. Thankfully this is easy enough to revert, without downgrading your phone.

  1. Go to Settings > About Phone
  2. Repeatedly tap Build Number (7 times) until you see a message “You are now a developer!”.
  3. Now go to Settings > Developer Options
  4. In the Networking section enable Use Legacy DHCP Client