Wireless Shure ULX's resetting to 'Master List' even with Fr. Lock enabled

Have a couple packs do this a couple times.

I've had two mic packs come out on stage and be fine for a moment and then a few minutes later are no longer sending signal. A2 goes to pack and finds the "00" when the pack is in Master List Mode. Is there a way for a Shure ULX1-M1 bodypack to reset into master list mode even with both frequency and power locks enabled?

Or do I just have coincidentally two packs suffering from the same malfunction?
 

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