I sometimes have this same problem...
Trouble is, the "amount of wrist movement" is hard to quantify. The only way to really tell if it's a problem with you or the watch, is to test two or more watches and see if the problem happens on all watches. Obviously, if the same problem happens on say two other watches, the problem is almost definitely lack of movement because it'd be very unlikely that all three watches are broken simultaneously.
I have two other automatics besides my datejust (a fairly new Tissot 7750, and an old Tudor) and all three will sometimes exhibit this problem of stopping during the night. In fact, I can typically predict when it'll happen now.
Since you say you've changed your work activity in recent years - and your new activity sounds very seditary, I think your wrist movement is simply too little.
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