Panasonic DLP TV Bulbs
Make sure its an original Osram or Philips bulb inside the housing. If its a cheap lamp it will act this way. If it is an original lamp, then you may have a power supply issue. It shouldn't affect your TV but you may want to try resetting the lamp timer by following the instructions that came with the lamp.
TY-LA1001 Timer reset
While pressing the VOL- button on the projection display, hold down the number 0 button on the remote control at the same time for more than 5 seconds.