I flashed Lollipop on my Nexus 5 yesterday, everything went fine but I notice both the wi-fi and mobile signal icons have explanation points next to them.
From a quick Google search I found out this indicates some type of connectivity issue with the internet and Lollipop is switching to mobile data instead.
Sometimes it comes up asking me to "sign in to network"which is strange because I'm at home and not using a public connection.
I don't know how to fix this, my Nexus 5 worked fine on the wi-fi before I flashed Lollipop so maybe there was wrong in the flashing process? Anyone else experiencing the same problem or know how to solve? I've tried turning my phone on/off, wi-fi on/off, disconnected, reconnected etc but nothing.