My phone does not save settings at random times.
When I check/uncheck an option in the menu, leave the menu and go back again, the setting haven't changed.
This problem causes me to be unable to disable packet data network and GPS (and other settings).
Only way to fix this problem is to turn off the phone, remove the battery for a minute and then turn it back on.
Model number: GT-B5510
Android version: 2.3.6
Baseband version: BB510XXKJ2
Kernel version: 126.96.36.199 root@DELL149 #1
Build number: GINGERBREAD.CEKJ2
I hope I provided enough information.
Thanks in advance!