Check what firmware you have and shoot a log to Terry. If it's what I think it is, it has already been fixed on the firmware because I had a slight pulsating issue before and with the logs that I and others had sent it was fixed.
Also, go here:
http://www.n54tech.com/forums/showthread.php?t=10605
There is alot of information adn should be able to find other information too.
Good luck.