Hi Seedar, You might try unplugging from the mains and taking yuor battery out for five minutes. It may re-set itself. You can also disable the alert signal-----
dot7--scroll to setup menu-----ok----scroll to alert signal----ok---scroll to off----ok
Howevr, this doesn't fix the problem as you no longer have alert for other things.
Let us know how you go on, and welcome to the forum (according to my pc you joined tomorrow)
Andy T.