Morning we have been having issues with our R98H UV printer, Richo Gen 5 heads, single row plus white, had new new since Jan 2020. The cyan will drop out in the center of the printhead. We have been adjusting negative pressure up and down but no change. Flushed the printhead out, works for a bit then starts dropping again. We replaced the ink line and filters worked for a few day then back to the same issue. Not sure if it could be a bad print head or some type of electrical issue. I was checking to see if anyone else has had a similar issue with gen 5 heads. Thanks