I have a AIR-LAP1131AG-A-K9 configured with autonomous IOS and power injector.
It stays up for 5-8 minutes then reboots.
I swapped out the ap at the far end of the Cat5 drop, but the problem persists. The ap, however, stayed up all night when directly patched to the power injector.
The entire 137 foot cable run from patch cord to drop to far end patch cord passed a (cheesy) Cat5 cert tester although it appears to have some split pairs.
I will appreciate any ideas for isolating this problem.