1. Clean and lube your gun up first. Make sure the bolt isn't binding up, I.E. The O-rings on the bolt, etc. Then put it back together.
2. Put in a new BRAND NAME battery.
3. Adjust your dwell using the sticky in the main Ion / Ion XE forum following the directions VERY CAREFULLY.
3.5. Make sure you have enough air in your tank. (or CO2 if you use that...)
4. Enjoy your fully functioning gun.
I'm pretty sure (85%) that this is a dwell issue. Make SURE your increasing / decreasing dwell... not ROF or firing modes. Use your manual or like i said, the sticky. Good Luck.