My 66U B1 prompted me to update to latest firmware with one-click install. I did so, with the result that devices that connect to my guest network have no internet access (they do not get an IP address). At the advice of ASUS tech support, I spent hours and hours factory resetting my router and AiMesh node and reconfiguring from scratch. Same result...no Guest network internet acess. Using the manual upload of firmware through the Administration GUI, I went back to the 220.127.116.11.386_43129 firmware without any factory reset, and all is well again. Anybody else have a problem with this new firmware?