I have a running support case with the latest v15 firmware not reliably working

This is still an ongoing saga with Netgear support (since they released v7.2.7.15 early last year). I have upgraded the firmware from v7.2.6.31 to v7.2.7.15 around 20 separate times to reproduce the issue and to try numerous things and debug captures for Netgear. Each time I revert back in order to be able to stream on my TV, which needs to be ethernet connected as it's a 4K. This issue is only with the RBR860 Router's ethernet ports not the satellites. I suspect it's an introduced auto-negotiate or QoS bug in the firmware.

I noticed that v7.2.8.5 was released recently, so I tried updating to this, but unfortunately the issue comes back. So the latest firmware also exhibits the issue and this release must just resolve some security vulnerability.

I'm now researching alternative brands as my ISP will no longer honour the warranty on their supplied RBR860. I purchased my own satellites, so I cannot accept their alternative product they are offering to see if this resolves the issue, which of course it would, but would leave me without compatible satellites and their router would not provide sufficient coverage on its own. So my next potential step if this drags on for more months is to buy my own replacement high performance router and matching satellites and migrate away from Netgear, not using the ISP's current model which is a low performance model with not satellites.