Last couple of months I have had trouble with cruise control. I push the button on the steering wheel and cruise control displays but the set light just flashes. On occasions I can't get the cruise light to come on at all. Yesterday I got the cruise on eventually (with set light flashing) and could not turn off. You might think it is the on/off switch but I ain't too sure if this is the problem. I have switched engine off, waited and tried again with some success in past but this no longer worked yesterday. Having said this i drove to Newcastle last week and it worked fine, switched on/off, set properly and all good. Any suggestions or similar problems?