New Orbi firmware 2.1.2.18 update issues?

After months of happy operation, I have had significant latency problems the last two weeks. For example, Instagram (a request-heavy app) would seem to stall loading Stories and the Search tab.

I noticed in the Orbi logs that it had been updated. I tried rebooting the modem and Orbi devices. I tried resetting the modem. Nothing seemed to work until I did a "factory reset" of the Orbi system (putting the paper clip in the reset hole until it blinked amber). Once I resetup Orbi, the latency  problems went away. Doing the factory reset only reset to the defaults of version 2.1.2.18, not the version of firmware that came with the device. That said, the problems went away once I resetup Orbi after resetting its defaults. Not a good upgrade experience, Netgear.