Plex client borked on Android-phone

I just had an issue where Plex on my android-phone constantly nagged about synced items, claiming that the server needed updates before it could sync.

My phone also constantly tried to resync, then discarded the download, resynced, discarded, etc.
Data usage showed about 1tb of transferred data before I noticed.

Resolution was to wipe data from client, and re-authorize it.