CCR2216-1G-12XS-2XQ IPTV and other Problems

Good day everybody.
I have a Mikrotik CCR2216-1G-12XS-2XQ with router OS 7.13beta3.
However, I have had various problems since the beginning that I would like to address.

The first problem is with the router is IPTV and IGMP proxy. I just can’t get it to work.
I have read and watched various tutorials and courses but I can’t get any further. IPTV runs when I restart the router. The first channel I access works fine. When I change the channel it no longer works.

Solution 1 is to restart again or I can open the local network interface in the IGMP configuration tab and deactivate and activate the configuration.
The channel then immediately starts the stream. But only this channel. I have to repeat it for every channel zap / change.

Can someone help me there?

What further information do you need?

Many thanks.

I was able to solve the problem with the IGMP proxy.

You won’t believe it but ChatGPT was able to help me in 2 sentences.

I had to lower the values: Query Response Interval and Query Interval.
Now everything is running perfectly.