update: an hour later it had deregistered again. Mayday, this time around, had me do a hold power button for many seconds reset, *& so far so good.
they will monitor and call me back tomorrow. Last resort will be a complete factory reset and lose all sideloads, all passwords etc.
if it keeps happening I think I can negotiate an out-of-warranty trade in /trade up for a new one. google tells me I am not the only sufferer but offers no guaranteed fix.
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