After some time my RB2011 is losing interfaces. A reboot will bring them back, but again they will disappear. Even with those interfaces not appearing, most functiona are still operating normally. I only noticed this because of an AirRouter that I use as a repeater was no longer connecting. Here is a list of things i noticed:
wlan1- was not present (it was still allowing clients to connect and passing traffic)
vap-wlan3- was not present, Master Interface is wlan1
vap-wlan2- was preset with corresponding wds1 even though it's Master Interface is wlan1 (this AP is used with the AirRouter)
MainBridge - Not present and bridge-ports showed "unknown" for their associated bridge
UBNT - Not present (normally unused)
Address for MainBridge, the router normal IP, showed "unknown" for interface
Address for vap-wlan3 also showed "unknown" for interface
2 seperate wan addresses where not present at all, these are both dhcp-clients
These are the only things that i noticed. The first time I saw this issue, I created a new Bridge interface and added just one of the ports to it and all of sudden the other Bridge interfaces reappeared. I rebooted after changing the port back to it's original and deleting the newly created Bridge interface.
I have screen shots that show these error, if you like for me to post them and supout file.