I've had my rifle about 3 years and it's been faultless. Other than a little bit of maintenance I've not needed to do anything with it but I'm the past 6 months I've not been able to use it as every time it's been chrono'd it comes back as too powerful. Last night it came back between 330 & 360 FPS. I've adjusted the hop up, changed the battery and cleaned it but still no good. Any ideas? Anyone?