Driver MT7915E?

I built a firmware with mt7915e for a little Zyxel box Multi M1 n progress

the speed is so good some 600/ 450 Mbps

i use as thiis:

Internet fiber <- Lan -> Livebox 6 <- Wifi 6 -> OpenWrt relayd+ igmpproxy <- Lan -> PC or Orange TV UHD

the problem is that the TV stream arrives with dropouts which is annoying does anyone have an idea ?

Let's start with your configuration:

Please copy the output of the following commands and post it here using the "Preformatted text </> " button:
Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/wireless
cat /etc/config/dhcp
cat /etc/config/firewall

Would be nice to know which version/commit of OpenWrt you are running.
Also, I think the words driver and firmware are wrongly placed here. I assume you have not built a firmware, but you probably have built "OpenWrt, which includes the firmware, the driver and a bunch of other stuff". I would rename this thread from Driver mt7915e to "Package loss - Zyxel box Multi M1 (MT7915e)" or something similar.

Also, obviously the fault could also lie with your Livebox 6 or your PC or your Orange TV. the OpenWrt relayd device is only 1 out of 3 or 4 devices in your network.

Also, how did you know that you have package loss?