Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
To isolate and fix this issue.. We need to run through this page methodically, step by step.
Most likely, steps 5 and six to clean the corona wire and update the firmware will have the most effect and these steps will probably be the ones that fix the issue.. However, lets not skip any steps. Please start from the top and go through each suggestion carefully.
If you get stuck, or have any questions at all please dont hesitate to respond as I strive to provide 5 star / excellent service. So im at your disposal if you need further help, get stuck, or if these steps dont work.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.