The focus light came on last night and will not turn off. I've restarted and reset it but the light remains on. Any idea what caused this and how to fix it?
Seems you're quite frustrated of this problem,
Sometimes there are some network carriers whose protocols interfere,
with the working of the software of the phone.
I'd suggest you to take your current SIM out and put another one in
This should solve the problem, ask your network provider about it
They should probably send you an update regarding this.