That cycling if allowed unchecked can do more damage and increase the cost of the repairs.
Unplug and call it in for service. 1800SAMSUNG in USA and other numbers in other countries.
I have had good luck with my Samsung R5067W 50" DLP. Purchased in 2/2006 it is now beginning a constant restart from normal operation, to frozen image (sometimes with audio tracking fine) to greenscreen,to shutdown then start up where it runs fine for 30-45 seconds then starts the whole thing over. I have tested cables, cable signal, and other devices, no differnce.Any input on problem souce is appreciated.