I echo everyone's frustration with the RB532 and Atheros based wireless mPCI cards.
My conclusions so far is that there are no grounding issues from the dongle. RB/wireless card locks up while changing settings regarding wireless config. For example switching from Station to AP Bridge or changing channels.
Powering off, removing card, powering on, then same again with card back in sometimes brings the interface back, often not.
When I have access to the card I can see other AP's
I have had none of these issues in my desktop PC based routers yet have now own 3 RB532's and 3 different mPCI wireless cards with the same problems sporadically persisting on each combination of RB and wireless card.
At this time I won't put any more effort into troubleshooting what to me definately is a hardware compatibility problem.
Can anyone recommend a routerboard and mPCI wireless card combination which does not have this compaitbility issue?