Mine was slightly different - turned out my battery was failing on my wireless! I was checking leads and the settings etc!
It happens, right? I gig with a flat of fully charged Eneloop Pros now just in case. (My mic and guitar and in ears all take AAs). Nothing worse than having gear choke out mid set. I used to use the energizer industrial batteries, until one day I forgot I was out, and just grabbed a set of shitty gas station batteries - still energizer, but they died in my mic mid way through set #2. I did a battery change during an extended solo.
Must have looked funny from the crowd.