first and foremost you should contact TAC - this issue on the surface seems bigger than something that can be solved via the forum.
Having said that, and Ignoring the signal strength one as that seems unrelated, my first question is what exact ArubaOS version are you on ?
At least two of the below problems could be explained by recent bugs (there was a client match issue that caused APs to get stuck until reboot, and various mdns mem leaks on the controller that could be causing crashes which would manifest as problems with the webUI etc.)
regards
jeff