I had exactly the same problem with my new SE 2. Charging stand failed (unsure of why) and phone would not charge on new charging stand which was otherwise working properly. Fixed by totally shutting off phone and then restarting. In doing research on issue found several sites that suggested solution was a "hard" restart of phone which involves holding the start and home buttons down at the same time. As noted however Qi charging was restored by just turning phone off and then turning back on. From what I have read seems like Apple has built in a protection circuit to prevent Qi charging if battery in phone gets to hot during Qi charging, which might be caused by a fault in the phone battery or a fault in the Qi charging stand. In my case I went through 2 charging stands that both proved to be faulty before buying a different brand of Qi charging stand that works fine. Nobody seems to write a lot about the issue but overheating seems to be an issue with Qi charging stands.