I cannot figure out why certain channels have intermittent outages of service. They tend to occur at night and it is not every night. The Channels I have noticed being out at TBSHD (247), ESPNHD (206), TruTVHD (246), TNTHD (245), HBOHD (501). I have been through plenty of material on the transponders and what channels are associated with them and it appears that these should have good enough signal strength to work. The only Satellite locations that seem to have no signal are the 99° ones both (c) & (s) and a few transponders on 103°(s) 1, 17, & 18. I am at a loss and not really sure how to resolve this and being an intermittent problem I do not want to waste time and money on a service call. Any ideas on how to get these channels back in order?