If AU = Australia, there is a Microsoft Store in Sydney, and if you are close (I
know it's a large country) it would be worth going there with your hardware.
With two separate type covers acting this way, unless there are environmental
issues (extra heat/cold/humidity, etc.) I'd think software (which doing a
complete wipe and reinstall from a downloadable recovery image should help
diagnose).
the T button getting stuck ? doing what?
I'm Australian but live in the Philipplines, was just chatting to the AU support.
If I was at home I would go to the store immediately!
When I was typing I used 't' and it went 'ttttttttttttttttt' or more.