I'm on my second G90 unit and continuing to have persistent dropout issues. I've tried scanning for channels with least interference, switched my wifi router to 5ghz only (disabled 2.4ghz antenna entirely), tried new cables, nothing seems to help.
I have my unit in the same rack as my Sennheiser EW300 IEM transmitter, and thought that might be the issue based on the post here, but I quoted the above sentence because I read the aforementioned post #33, and the point being referenced here doesn't bear that out. The point that poster is making is that he uses the two in the same rack and they do NOT interfere with each other, since they utilize completely different signal bands.
There are technical reasons why it's bad form to put an IEM transmitter and a wireless receiver in the same rack, if they are working in the same band.
I too use line 6 and Sennheiser - and because they work in different bands, they don't interfere with each other.
I've tried the various troubleshooting tips and nothing seems to help. I can't get another replacement unit, the vendor I purchased it from only allows one exchange. The really frustrating thing is I have none of these issues with my G30. I thought I was upgrading when I bought the G90 but it remains to be seen. Very frustrating!