Andriod phone disconnected randomly from Wi-Fi

[Gaurav1]

We like to use Andriod phones as SIP clients but Phones disconnect from network randomly. They may not disconnect for 2 days or may disconnect in 2 hours. If two phones sitting next to each other, one stays connected, another disconnects. To bring them back, we need to move out of coverage area and come back or turn off the wi-fi and turn on again. We have cisco WLC and cisco APs for wifi network.
I used an APP called Wi-FI fixer, and attached are logs

[RobertZ]

Here is a doc we at zebra/moto used to provide for VoIP deployments in Cisco environment. I hope it helps..

Deploying VoWLAN Over Cisco Wireless Networks

[Gaurav1]

Yes cisco have checked WLC config and they think, it's fine.

[Ronald_Dvorak]

"We have cisco WLC and cisco APs for wifi network."

Have you tried to get help in the Cisco forum ?

[RobertZ]

Have you checked for latest Android OS update? you may have an old version of OS. BTW what is the Android device you're using?