Recently I have been having a problem with my Etha where the bolt wont cycle with every trigger pull. Sometimes the bolt will not cycle and a little air will come out of the grip frame. I think it is the noid. A few weeks ago I forgot to reset the regulator after I took it apart. When I gassed up the gun I over pressurized the noid and it started venting.
I have the gun chronoed at ~285. So far I have tried replacing the battery, lubing the bolt and reg, increasing the dwell and I checked the noid for any cracks and made sure it wasn't loosening from the grip frame. Increasing the dwell seemed to help a bit but it is currently at 13 ms and the problem still occasionally happens.