It gets confusing.
What are you running Channels DVR Server on.
What are you running your FrndlyTV docker source on.
What devices are you using to watch from (192.169.1.4 & 192.168.1.142)
Appears you started watching channel 10387 using one device, switched it to channel 10386 and then you start watching channel 10386 from another device (watching from two devices at the same time).
Everything looks normal in the DVR log.
Perhaps you're exceeding the stream limit you're paying for with your FrndlyTV sub (Basic=1, Classic=2, Premium=4).
If you don't see any errors in the container log, try using a different browser?
Don't know if you're watching in a browser or on the iPad app on your iMac.