I loaded 1.2.6 this morning and at a glance things appear to be normal. Of the 34 devices connected I did have one, a GE cloths washer, that took a little convincing to connect. If anything changes...

@David-TP Thanks. I'll try it tomorrow.

@MelVit Hi. I'm sorta techie and was able to follow the instructions provided in the firmware download. https://www.tp-link.com/us/support/download/deco-xe5300/v1.60/#Firmware You'll need the LAN IP...

@SocorroC I finally had enough of the 1.2.5 firmeware trouble shooting and downgraded to 1.2.2. Everything is working as before. Next time I'll give it a few months to see how stable the new firmware...