Sky HD, TM6800HD, Manhattan Plaza ST550 and TM1500 CI+. 1.0m dish and 36v motor, Panasonic DVD HDD recorder and Panasonic video/DVD recorder. Sony G800 HD TV stand/surround system + Sony KDL40W2000. Infinity USB, Elvis, CAS1, CAS2.
Try a systems reset - remove SIM and start phone - this carries aout a mastrer reset. When message Insert SIM appears, power down, insert SIM and restart. Should cure it. I manage about 40 users with same model - it's a little "undocumented feature" ;-)