PAM312 has stopped. HELP

[The Wesminator]

Hi.

My 312 started to play up slightly a few weeks ago and now:

1. The hour hand will not move smoothly if not at all to set.
2. When you set and pop the crown back in it jumps a hour.
3. Running fine on the wrist until taken off and then runs for no more than an hour.

Any ideas??

Really nervous about sending it away after all the horror stories online.

Wes