Alcatel OneTouch 983, Android 2.3.7
I normally have "Enable data access over mobile network" switched off so as not to drain my phone credit, only switching it on when I want to do something quick on the Internet and don't have wi-fi access where I am.
However, a few days ago, for no apparent reason at all, this setting began switching on at intervals without me doing anything. Tried switching my phone off and on, tried killing most of my running services, has made no difference. Generally, a few times a day I find that it has switched on.
Have installed AVG Antivirus Pro and it found nothing.
Any clue of what it could be that's doing it - and more importantly, how to get rid of whatever it is? I hate to imagine how much of my phone credit it has drained!