Check and compare images (firmware) on both receivers, settings, etc.
Everything must be identical.
Otherwise, change packages between the receivers and see the results. These are your receivers and you have to better know - why is the channel working on one receiver and does not work on the other.
This is not a problem of the server, you see it by yourself.
P.S. Show log-file of the channel (and receiver) which is not working. We'll analyze it.