Problem with m-service message

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Hi, sometimes it happens that when I unlock the phone (slider), I get the message "automatic m-service synchronisation" and I can choose between "ok" or "cancel".
But whatever I choose, I can't go further.

I have to press ok/cancel rapidly and in between try to unlock the screen.
Then I can press the home button (also rapidly) and suddenly the message goes away allowing me to work with the phone.

I searched eveyware, but I can't find something to check/uncheck.
(automatic synchronistaion is off for my accounts)

Any ideas?