Thanks for the replies, it's a start.
Do I understand correctly that your computer came pre-installed with Windows 10 from the factory?
Can I please have your computer's manufacturer and model number?
If it works well for a while and then stops, the root issue could be the driver crashing, or a changing network condition like another device tries to register the same IP address or DNS name with the router. Just hard to know at this point. It's not impossible that the card itself fails when it gets warm but that's incredibly unlikely, especially if you can "fix" it by resetting it with the troubleshooter.