- Try a new battery
- Relube the bolt(also, what lube are you using?)
- Check the dwell, make sure it's stock / try raising it
- unscrew the reg all the way to the bottom, then screw it in all the way till it stops, then re-chrono it
- Take apart / strip / relube the reg
In that order, seems like do the easy things first, if they don't work move on to the more complicated ones.
I remember back when these were new they had a bunch of factory issues(and since you bought it new) you could be suffering the same. They made a nice thread on PBN on how to clear up a bunch of the issues, but be careful if you're not familiar with paintball markers you should watch a video and be really careful. Only work in a clean environment on table or somewhere you won't lose pieces.
Here's the thread(but be careful!) How to fix your G4 "out of the box" issues.
And welcome to paintball, glad you like it, and this is the bestest forum(cause I'm here)