SPH200D - Locked On Hold

[Skypewriter]

Whenever I call a normal phone number using skypeout or make a skype to skype to skype call - after the call connects it's automatically placed on Hold??? I've tried hitting the green phone button but the best I get is a move from 'hold' to 'resume'. So at the moment I can't call anyone using skype and they can't call me. Not very happy. Has anyone else experienced this? Any ideas? I've had the phone for 8 months and this is the first thing that's gone wrong with it.