Is it a one-off problem or are you having issues with Google drive files all the time?
Things to try:
Reboot your router/modem. Turn it off and leave it for for at least 30 seconds before turning it back on again.
Reboot your PC. From Windows 10 onwards, a 'shutdown' isn't always a full, hard shutdown. Use the reboot option instead.
If you're using a wired connection, check that the network cable isn't damaged and that is properly plugged in at both ends.
Try at a different time of day. If you're in an area with a lot of people using the internet via the same ISP you could have contention problems where you're all sharing limited bandwidth.