My wifi throughput went from a consistent 65 Mbps down to less than 1 Mbps.
I noticed several new active appearances in device manager:
Here's what I did to fix my issue:
1. IPCONFIG /RELEASE
2. Reboot my router
3. Reboot my laptop
4. IP CONFIG /RENEW
Thereafter, the newly discovered devices reverted to their previous "inactive" state and my wifi throughput speeds returned to normal:
Just something to try if you run into the same thing.