Android 5.0 Lollipop has been rolling out on a ton of devices over the last few weeks and it seems to be having some difficulties on various Nexus devices.
Wifi Connectivity Problems: After the update Nexus 5 users are having spotty Wifi connections and issues with getting connected in the first place. There is no real solution yet, but toggling your phone in and out of Airplane mode typically will temporarily fix the problem. Google is working on a patch.
After Update Patch Failure: Some Nexus 9 users are having issues installing the patch that comes right after the update to Lollipop. The update will crash and revert everything back to the previous version. The solution is to install the factory version manually or simply wait until Google fixes the issue.
Video Playback Errors: Some Nexus users are having issues with video playing Apps not being able to use playback functionality. There is no permanent fix at the time of this post, but going into the app settings and resetting the App cache will fix it temporarily.
More posts to come with Android bug fixes.