I transferred to BT a few weeks ago, getting a new router. One PC (a HP6200, 64 bit W10) works fine and my TV and internet radio stream perfectly. My download speed is ~70Mbs.
A second PC (a HP8200 running 32 bit W10) has very poor connectivity. It's at its worst when woken from sleep, and then improves a lot over the next few minutes, but is still not very good.
Any advice much appreciate
How are your 2 PC's connected - wired or WiFi and distances from the router? When you say poor connectivity can you expand on that poor in what way?
In computer terms the HP8200 is an old PC. Have you checked on the HP and the manufacturer of the network card site to see if there are any upto date drivers for the computer.
You should also check that the "Wake on Lan" is set corectly.
See link