I went through those steps on both my Hitachi Roku TV and my Roku 2 device. The audio/video sync problem on live TV persists even after removing the Paramount + channel app, resetting the Roku, then re-loading Paramount +. For the record these are the device/build numbers:
Hitachi Roku TV 5510X, Hitachi model 50R5, software version 10.0.0, build 4195-32
Roku 2 model 4210X, software version 10.0.0, build 4195-04
Paramount + version 5.2, build 20210421 (same on both Roku devices).
This problem began early May, still not fixed. Paramount + either not aware or don't care their app has this incompatibility with Roku. Not sure what to do next as Paramount + not responsive.
I have this problem too. I followed the instructions in this post and have the same problem as before. No improvement is noted. How do I go back to CBS All Access? I never had any issue until I was forced to upgrade to Paramount +.
Well here it is 7/8/2021 and the Paramount + channel on all three of my units are out of sync. Two on the Roku Stick and one app capable. I have performed the suggested steps of removing / reloading the Paramount + app with no fix... Tring to be a smart senior citizen and save a bunch of $$$ by cutting the cord from Xfinity cable but no luck. This poor return on my investment my force returning to Xfinity/comcast at a draining cost monthly.