We had a similar recent problem with the friends and family link. It changed my daughter into my friend's husband--gave him all her passes, adrs, resort reservations, tickets, magic bands --everything that was hers became his. She disappeared from the account, he was in my family and he was not even going on trip! Ugh. Three days later, after many hours on phone, IT finally fixed most of it--except her customized magic band (now deactivated completely), her Be Our Guest FP and her 7dMT fp! Gone! New magic bands are on the way. They have also said they will have some special pass waiting for her to get her on 7DMT ride but my confidence is not high at this point. Nothing can be done to fix Be Our Guest.
Luckily, for us , it happened pre-trip. If it had happened while we are there, the three day fix would have ruined our trip for sure!
On another note, in Feb, the magical experience switched my two daughters. I normally would have had one just use the other's bands, but one was going to parks and the other was not. It took about 24 hours to fix. Plus random moments of one or all bands not opening our doors.
Like the op, I do take the approach that it could be worse, and try to work out around minor problems. That way I don't let the stupid annoying stuff become big-my-vacation-stunk kind of problems!