Account management

If you do not wish to disable uBlock Origin, you can extend the duration of time before QB Online times you out to be 3 hours by going to the Gear Icon → Account & Settings → Advanced → Scroll down to Other preferences → Adjust Sign me out if inactive for to be 3 hours instead of the defaulted 1 hour. This won't resolve the issue, but it will decrease the number of instances you are asked to do MFA.

Asking your ISP to switch you to a static IP may help as well.