...This morning I realized it was beating so I reset the time and wound the watch...
What do you mean you "realized it was beating"?
If all that was done to the movement was that the rotor was removed, it will still be susceptible to the sudden-death-syndrome issues of the A7750 movement. This could be the case.
Also, make sure you don't run the chrono if the watch is not fully (or mostly) wound. This can destroy the movement.
Don't set the time or date when the watch is between 10pm and 3am - this can destroy the movement.
Don't push the reset pusher when the chrono is running. You must stop the chrono before you reset it or this will destroy the movement.
Don't hand-wind the watch fast - slow steady turns only or you could destroy the movement.
If you do everything right and treat her with kid gloves, she can still crap out on you for no appearant reason.
Let us know what David says. Good luck!