[dipper]

Did you purchase the rifle new or used??
Do you know the history of the rifle?
Seems funny that if all was well, that the rifle just started to act up--although I guess it is possible.
I know a few remingtons with thousands and thousands of rounds threw them and countless trigger pulls and the triggers are fine.
I don't know one were the trigger all of a sudden displayed what yours is doing but that doesn't mean it couldn't happen.
If you don't know the complete history of the rifle and purchased it used, someone could have messed with the trigger.
Either way, take it to a good smith and let him look at it---he'll be able to tell you what's going on and it shouldn't run you over $25.00.

Dipper