Work through these checks
Check whether it affects one channel or everything
Try another live channel and an available VOD title.
Try another device where available
This can separate a device or player issue from a broader service issue.
Restart the player and device
Close playback fully, restart the device and test again.
Check the connection
Confirm other apps can connect and reduce competing network activity while testing.
Record what changed
Note the device, approximate time, content type and whether another channel worked.