I am missing SpikeHD, SyfyHD and History HD on all of my receivers. I am getting 771 "Searching for Satellite" on all of those channels. Any ideas what this could be?

722 receiver. The Skip Back button is supposed to skip back 10 seconds. Usually it works but sometimes it skips back several minutes. Skip Ahead is supposed to skip ahead 30 seconds. Sometimes it skips ahead several minutes. I searched the forum but saw no other mention of such problems. Is this...