iPhone 4 Bluetooth connection issues

Hi all,

Up until last week my iPhone has been fine, recently though my phone won't connect to anything in Bluetooth mode.

If I go into settings and switch Bluetooth on I get the little symbol next to the battery to say its on but as soon as I come out of the settings the symbol disappears.

If I go back into the settings it will say it's turned on but it still won't pick anything up and can't be found by others.

I have done nothing different to usual and am running the latest update for my iPhone :-/

Any suggestions I could try, I've tried the usual rebooting and syncing the phone but to no avail :-((


Cheers

Gaz.......