Well, my connection is still dropping every 30 minutes after reboot

I guess time to call NTL and see if I can get a new modem unless anyone has any advice they can give me? Can I just confirm that rebooting the CM really is just pulling out the power cable and nothing else? I hate calling Tech Support and try to avoid having to do so unless I really have no option... Also, how do I check what version of firmware I have?