List of significant defects on my 19A upgrade so far:
1 - Critical - voice control does not work at all, and the steering wheel button has no effect.
2 - High - navigation voice guidance does not work at all.
3 - High - intermittently, system is unable to access Media Library and slows down whole system
4 - High - existing, previously functioning SIM card now says 'SIM card not supported'
5 - WIFI set up forgets settings
6 - Navigation map auto light/dark theme does not work.
I expect I'll find more
Going back in next week - be interesting to see whether it's
a) a botched upgrade and just needs done properly
b) going to get patched or even upgraded again????
c) rolled back to an earlier version (altho I think I've read folk on18C have had voice issues?)