Losing traffic, live streams buffer

Hello,

Am got myself 5G NSA connection from provider I've got another fiber connection. The connection came with NR7101. I've already installed these updates:

FW: 1.00(ABUV.6)C1
Module FW: RG502QEAAAR11A07M4G

The connection max BW is 500/50 Mbps and am getting it without problems. Connections to IPTV servers is 300 mbps both fiber and 5G (its the same ISP, just different technologies, so route is the same).

The issue:
When I watch HQ IPTV (incl 4K) stream in original SAT TV quality using NR7101 in LTE mode, it is ok, while it downloads not that fast like 25-40 mbps per HLS chunk. But as soon as I switch it to NSA mode and APP "understands" it can have higher bitrate and starts to download them at 70-90 mbps rate, picture starts to buffer as from time to time I see some kind of holes in TV port's traffic. It just doesn't get any data for some time, then its preloaded buffer runs out and it starts to buffer. When I switch to fiber connection, there is no such an issue while it still gets chunks at 70-90 mbps bitrate. TV's port is 100 mbps. So the issue is only when I watch it in NSA mode and it seems like NR7101 issue to me. Sometimes after router restart it works fine for some time then it happens again. Some pics attached.

This is in LTE mode



This is using fiber as uplink



and this is in NSA mode, you can see those "holes" in traffic. With smaller ones it doesn't buffer, but as they come more often and become one large, like last one, it stops and buffers. From provider end-pont the NAT session doesn't get broken, its just something wrong with 5G router.



Oh and the connection is still up. When this pause happens I can ping the server, can telnet to it's port and can surf the internet.

And the most funniest thing is when some other device watches youtube or something similar (ie generating traffic) there are no such issues also.