ROKU 4 pops and stops output to the HDMI port for a second then continues sometimes
I have a ROKU 4 which I purchased in 2016. It has recently started giving a loud audio POP and then the HDMI output stops. This sometimes happens for just a second, and then the program continues uninterrupted. This has been happening with annoying frequency lately, sometimes two or three times or more during and evenings watching. Sometimes I have to power down the ROKU before I can get the output back again. Is there a solution for this, or does it mean the unit is breaking down and needs to be replaced. Has anyone else experienced this? The ROKU is connected by an HDMI cable to a DENON AV receiver which controls the audio and video output.