I wouldn't necessarily say it's an actual problem without really testing it, and if there isn't anything else wrong with the machine [no other symptoms] then I may not worry much about it. But, you can test it with a meter to see if it's a real problem and if it is, replace the PS.
http://forumz.tomshardware.com/hardware/modules.php?name=Forums&file=viewtopic&t=202996&highlight=