I wish it were bubbles. Support even had me send in a video, no bubbles. They can’t figure it out. I’m going to try moving everything really close together and shortening the tubing, otherwise I’ll just keep my Alkatronic because it’s always been rock solid.I have not had an issue with mine other than the bubbles in the reagent line and I pulled it off and flushed it out good with water using a syringe. Then reinstalled them and so far no issues.