welcome to the crowd...i have one that did the same thing...silverduck had some success by having channelmaniac remove and burn a new nvram chip for his...there's a thread on here about it...do a search and learn more....
there's some issue about the one he did not being exactly right, but i think it's just a difference between the 6 speed deluxe version and the regular version...when he got the new chip burned, he said it fixed the rtc self check error, but there was a problem with it being the version other than the one he had...i'm going to send mine to channelmaniac and see if that does the trick for me