I have two Apple TVs that both fail to play content from a HDHomeRun Duo after it has played content fromTV and the Apple TV has been used with another app or in stand by.
The message shown is streaming to the tuner failed. Press play to try again. Tuner unreachable.
Either disconnecting the HDHomeRun from the switch or power cycling fixes the issues with the Apple TV, but only for one session of TV viewing.
Both my iPhone and FireTV device continue working normally. When the Apple TVs displays this message so think it is client related.
Restarting the Apple TV does not resolve the issue, only the above with the HDHomerun. Both Apple TVs are running 18.2.1 and Channels is using 6.1.2
Any help would be appreciated.