I am having the same problem. Roku turns on and off on its own. I purchased the Roku device about 3 months ago.
The issue ID is ID 13-483-978. Roku Streaming Stick+ Model 3801x
Serial Number YH0057813513(213065813513)
Software Version 9.4.0 Build 4190-50
Timestamp 2020-12-02T0218.57Z I am using a Samsung TV Series 650 Model LN46A650A1F
I restarted Roku. That did not help. I reinstalled ROKU and that did not help. Change numerous settings and that did not help. I am extremely frustrated with the situation and see others that have the same problem.