In your Server settings, make sure your secondary service is disconnected, and your primary service is enabled.
Turn off you STB. (* then unplug power).
*also turn off other devices connected to your network (pc/ phone/ etc)
Reboot your Router (*not a reset, remove power for 5min. then power back on)
Wait 5 minutes approx.
Restart your STB.
This should set your stb a priority device with the MAC# comm. protocol to your primary service.
Then power on any other devices.
If you have the problem still, then i would suspect the buzz basic does not have enough available resources, to satisfy the overhead of data from the 2 (MAC based)services.
BTW & FYI, ...Always use a wired connection for IPTV service whenever possible.
Wifi is a last resort, as the wifi channels can become quite congested and noisy, depending on your location and surrounding environment.
*(Wired connections are quiet and dedicated just for the STB, and does not have to fight intermittent devices).
Also, IPTV LiveTV connections are different than VOD, or Streaming sites like YouTube, Netflix etc. If you have corrupted data packets while connected to a streaming service, the protocol used, facilitates a large look ahead buffer and a request method to resend a bad data packet. You would not notice any disruptions. Whereas an IPTV .ts stream does not have this, and will either pause and wait for the next packet, and if it is not the packet required to reassemble a block of data, will dump the in-process data, and start decoding the next data block. (It is noticed that some Servers may not handle this well and may disconnect, and I suspect it to be dependent on the Data Load of the server.).
/shooty