For some reason I can't use Android Support anymore on my Xperia X.

So, what's happened is since Wednesday just gone, Android Support has developed a strange problem. When enabling Android Support the Android App Stores (F-Droid, Store and Yalp Store) suddenly go into a loop checking for updates, throwing up repetitive notifications, causing some bad battery drain.
Android based web browsers become unstable (screen unresponsive and scrolling freezes regularly) and the virtual keyboard doesn't work when trying to type something into a text field (the keyboard will not stay on screen for more than half a second).
Everything is fine on the Sailfish side of things. I have uninstalled and re-installed Android support but to no avail.
Short of resetting the device, I've tried as many things as I can.
Any ideas?