I am having the same issue. Cannot use Comcast email on wifi, using the stock droid email app on LG G3 since about 5 days after I updated to Lollipop. It gets suck at "updating" and gets very hot until I manually hit the menu option and hit "stop". I have another email account (hushmail) on the same app that hasn't missed a beat. If I turn off wifi, Comcast will sync. I can't leave wifi off and use data 24-7! I am about to lose it over this. I do not want another app (xfinity). I want it to just work as it has for years. Too many hands in the pot (Google, LG, Comcast, Verizon) and no one wants to take responsibility. If anyone has found an issue, please reply!