Yes, they are can be symptoms daughterboard connector malfunction. First - test all 4 wireless in RB800 without daughterboard device. If test success add full temp. fix and check is it your RB502 have this fix - see attached pic. All RB502 shiped les then ~one year ago have this fix. Old RB502 don't have this fix because it designed work only with RB500. This fix improve mPCI stability to work with RB600/RB800 . Ignore the wire on picture - it's just additional grounding, you need to look for small brown 1000pF capacitor. If you don't have it put it like on picture.
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