One of the problems identified in the latest version of Android was that it was impossible to connect to some Wi-Fi networks. It is likely that in the coming days Google announced an update to solve the problem, but until then you can make use of the tricks that we present in this article.
Devices that are most affected by this issue are Nexus Nexus 5 and 10. In some cases it becomes impossible wireless. The first option to try to get out of trouble is to remove all the WiFi networks you suggested, in this way we will make a kind of reset. Some users have managed to connect seamlessly after eliminating stored WiFi networks.
Another option is to put the phone back in Factory mode, although it is not recommended if you've spent time in the settings of your terminal to your tastes or needs.
Another option that might work is to uninstall all applications that have not been recently updated in case they might be incompatible with Android 5.0. Same with third-party applications. It costs nothing to try, you only lose some time and you could be effective.
And finally, you can also try rebooting your router or change the channel on the WiFi network. You can do it manually or tell your provider to do it remotely. Those who have done so have, plus they now can connect, noticed an improvement in the performance of the connection.
But as we said at the beginning, these are just tricks to get by while waiting for Google remove the update that solves all these problems. We hope it will not take much ...