I've had this installed now for about a year without issue, but in the last few months it seems to have destabilized. The R510 seems to occasionally switch off and reboot, and the switch will occasionally lose all communications with the rest of the network, requiring a hard reboot of the switch to get it to start communicating again. The AP is running PoE, but I've checked the PoE allowance, and there is power to spare, so I'm not over-taxing the PoE allotment, and Spanning-tree is on so it should eliminate loop-backs.
This is a sporadic problem, so it's hard to trouble shoot (it rarely fails when I have bunches of free-time, usually when I need to leave in 5 minutes, and I'm already late), so what can I do to further find the source of this problem?