I heard a few grumbles about the cases getting stuck and a few about the bullets moving forward in the cases from the recoil (I forget what that is called).

The few grumbles I heard about were I stress "a few", I never owned one but would certainly buy one now if I saw one.

I also heard a few grumbles about the 340 j-frame .357 doing the same things but I've been using a 340 for 18 years and never had issues of that kind with mine. This is why I'd grab the 940 if I saw it.
No gun is perfect and you will always hear grumbles about something.