Hi,
So it could be a phone problem too… Software bugs, the phone freezes….
Ok, so the next step is to go in the delicious 3GPP website and check what are the scenarios when the MS displays “Error in connection”. Those messages are standardized, and f we are lucky, the phone will display this one only under some special circumstances.
Without any way to analyze this problem deeper (DT, traces, QoS stats), then it’s going to be impossible to solve.