Hi

Fact is many IPTV providers are in the lap of the gods when it comes to providing a stable service many are resellers so in turn have no control over what content is shown
channels come and go with only a few that you can call stable. I take it when you up grade your firmware that the box retained the IPTV providers data as sometimes these
can go walk about and you have to telnet/putty the access data again. Have you rebooted the receiver I have found from past experience an iptv looks dead in the water
but comes back with a reboot as it refreshes the link to the provider site. Failing that then yes your next action would be to contact your provider.