AC88U and slow internet

I have an 88U and the other day I noticed my internet was so slow it's almost unusable. I was trouble shooting and did multiple reboots to the router and modem. I found the slow speeds happen over wired or wireless connection. Local LAN speeds are fine. Transferring files from 1 computer to another max out the gig NIC.

Hooking a computer to the modem gives me full speed.

Backing up, factory resetting the router, and restoring gave me full speed for about an hour.

Next time I factory...

AC88U and slow internet