I have been a Directv customer since 2004 and never really had any issues that weren't of my own making. My wife watches a shopping channel on Channel 70, also DIYTV at channel 230, and Hallmark TV at channel 312. For the past week or ten days I am having a "771 searching for Signal Issue" on those channels but only at night. I get this on all four of my DVR's (three HR24-500s and an HR44). There may be other channels with issues but those are the ones I am aware of right now. Currently sitting here on a sunny Sunday afternoon all channels are coming in just fine. I assume the LNB or dish alignment to be the culprit since they are the common factor for all four units. At this point, I plan to put in a service call, but thought I should ask on this forum before I make that call. Any ideas or suggestions would be greatly appreciated.