Then I began to experience UI lockups and Chrome browser crashes for the first time. Performance was so bad I had to only run one app at a time so it would crash less often.
So, I had to download 4.4.4 and the SDK to re-install the OS. Some people call that a downgrade, but it was a hell of an improvement over 5.0.2. That was my first time to do that to an Android device and I was fearful of ruining it, but it worked. After the first night, the device notified me it had an upgrade (5.0.2!) downloaded and ready to install. I guess I'll learn to live with the occasional "nag", because I'n not going back to that version.
Yesterday I wiped the cache partition as recommended and so far no problems of any kind.
noun: exaggerated statements or claims not meant to be taken literally.