Sky go buffering on pc but not on phones tablets or consoles.

[shakka]

Sky go buffers every minute or two for 5 seconds on my pc but is perfect on everything else.

Tested two pcs and both do the same.

Pc's are, hardwired no wifi,  Ryzen 5800x, 32gb ram, m2 drives, 6600xt.

Pc 2 same spec but intel 4970 cpu.

Internet fibre 500 download 72 upload its not the pc's or connection clearly.

Mobiles, tablets and consoles on WiFi or 4g data are perfect.

Also runs in my car flawlessly on 4g.

Tried the usual deleting cache reinstalled turned off anti virus what else can it be ? It's driving me crazy ?