Default [Q] Wifi and screen bugs

I have an M8 for 3 months and since day 1 I have problems whatever ghe Rom or FW:
-Wifi wont connect automatically to the wifi signal when changing local, I mean when my M8 is connected to my office's wifi and I go back home it wont connect automatically to my home's wifi, I have to switch off/on the wifi on the M8 to let it connect
-The screen even on manual brightness take about 2-3 secs to really use the 100% brightness I chose!!!
Am I the only one to have these "bugs"?