My PC is connected via wire from my modem/router, they are close by each other powered via a surge bar.
I'm guessing EMI problem here, never had any issues til I installed a new GPU in my computer. It would shut off my router/modem after having my PC on for a while. Shutting my PC off would re-enable my cable internet connection.
Guess: There is ground loop issue from the PSU injecting high harmonic energy into the earth or chassis ground to the power adapter on the Modem/router unit, and temporally disable the cable connection. Never had this problem before, because the new GPU is higher TDP, so EMI signature is different at different load points is what i'm guessing here.
Since the coaxial cable has a ground connection, there might be something going on there where it can cause the ground path to be floated
Things I can think of to try, connect my PC to a different NEMA connector/ separate breaker. Add a ferrite coil around the psu wire.
Connect my pc via wireless connection. If this fails, it will implies an issue with the power connection/noise interference.
Curious if anyone had a similar issue?