I found that powerline adaptors were a great temp fix until I was able to run some cat6a through the walls / ceiling.

Sounds like a temporary permanent fix.

Could be seeing if it’s a modem / other hardware fault.

Id personally try a hardwired connection, and if the problem persists try a live Linux distro and see if the problem persists there.

3070? I remember receiving boxes of these which were delegated to prebuild systems.

These were screamers, up there with the two slot 3090 blower from gigabyte 🫠

Yeah take a look at TempleOS and it’s filesystem RedSea.

TempleOS is a rabbit hole in of itself, RIP Terry.

https://en.m.wikipedia.org/wiki/TempleOS