On November 6, 2019 at 10:08, punter16 said...
We just ran into this on Monday. We changed the output resolution in the Roku from Auto to 4K @ 30hz and then everything worked fine. Good luck!
About 2 minutes after reading this comment a client texted me.
"Its Netflix that is the problem, we watched HBO all weekend and soon as we switched to Netflix the TV went to no signal"
Procrastinating on paperwork really paid off on this one. Thanks!