Just encountered this issue this morning.
Have audio set to auto detect and it goes to “Dolby Digital Plus, DTS”. I hear a weird clicking sound and no regular audio can play.
Switching manually to just “Dolby Digital” is just fine.
Maybe some firmware update borked Dolby Digital Plus?
I have a RokuTV TCL 55P605, firmware 9.2.0, hooked up to a receiver.