Has there been a solution provided for this yet? I have a similar issue with my QN55Q65FM tv. I cant identify any pattern in the errors. It appears to be random for me. I have another Samsung Smart TV (UN65TU7000FXZA) and that one plays everything on the YouTube app without issue. It's surprising to see an issue like this with a Q series TV. Apparently they arent as high end as Samsung makes them out to be.
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