If this is IPTV do you have a multiroom sub. If not I think if you watch a satellite channel you can record an IPTV channel but if you don't have a multiroom sub you can't watch an IPTV channel and record one at the same time.
We need more information, we're stabbing in the dark, try to answer these questions before we go any further
Are you trying to watch one and record a second IPTV channel at the same time?
Which iptv app are you using?
are both boxes receiving iptv at the same time when you are getting recording failures?
What are you using to record to? - HDD - usb?
Have you tried setting a timer on your zgemma and instead of switching to smart iptv on tv just stay on the zgemma and see if it records that way if your on about iptv I have multiroom sub on my box and for me to be able to record whilst viewing another iptv channel I have to use the same device not seperate devices
Does your provider support recording have you tried service app
The channel your trying to record on iptv does it have epgMy zgemma is a twin tuner box .Even by presetting a programme to record it will record some or half and stops. It will record free to air channels but not channels with subscription. Provider doesn't have a clue, hence looking for help.