Roku Device Features, Settings & Updates

Help configuring Roku device settings, using Roku OS features such as screen mirroring, adjusting display type and audio settings, using Guest Mode, and assistance with software updates.
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Level 7

Roku 3900X unusuable after update 9.0.0 build 4083-51 Audio popping and Blackouts

On Dec 13 my Roku updated automatically to the new version firmware 9.0.0 build 4083-51 on my Roku 3900X Roku Express.
Audio crackling or popping sound every 10 seconds started at the time,  plus blackouts every 30 seconds or so. It deemed my Roku unusable. I have searched for ways of communicating this issue to your Technicians without success. Have searched the Rokum forums and have found similar problems.
Please HELP with any solutions. The obvious one is to reverse firmware version to previous one which was working perfectly.
Appreciate your help

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