I have a problem with a DishNetwork system that has, so far anyway, been unfixable by the DishNetwork techs, if anyone has any ideas about possible causes I would love to hear them, before we have it taken out and go to another system. In short the problem is a loss of signal lock on satellite 105-local channels-the current receiver is a 510 DVR, however this receiver is a replacement for the first one we had, the replacement was made in an effort by dnr to resolve the issue. We have had dishnetwork for 4 years and until about 10 weeks ago had never experienced any difficulties. When this problem surfaced it was out of the clear blue, I mean that nothing had been changed at our location, nothing added around us. The dish itself sits in an open area, with nothing that can get in the way to block it, and no trees, shrubs, etc. has grown up around it. The odd thing is that the problem invariably occurs in the evening hours. It has happened anywhere from around 8 o'clock Eastern time, to midnight. Never once has it happened in any other time frame, and in the mornings after an occurence the system is back to working correctly. It does not happen every night, but seldom misses more than one or two evenings without failing. An example..this week it lost signal at around 11 pm, did not go off Tuesday night, went off Weds night at 10:30, went off last night at around 8:30. If we happen to be watching anything other than a local channel everything is fine , then if we go to a local channel we will get an error 015, and off course cant get back to the other channels until the 015 goes away. If we switch to a local channel and are lucky enough to get an 002 error, then we can of course go back to the other channel and at least watch those. If we happen to be watching a local channnel when it goes out, it does so with very little warning, sometimes a quick flutter and then the 015 appears. Since the problem began everything in the system with the sole exception of the dish itself has been changed...receiver, switch, lnb's, all cable involved, and the ground block. Signal levels are high, according to each of the techs who has came out. All cable connections have been checked and tightened many times. I put a ups on the receiver just to eliminate any possibility of an ac issue. Nothing that has been done has made any difference at all in the problem, no better no worse. The frustration factor is quite high at this point, and spending around an hour or so on the phone each time we call support, and going through the same scripted troubleshooting adds to it. I know that since everything has been changed it appears that there could be some sort of inteference causng the problem, but if that was the case, then why wouldn't all satellites be affected, not just the local one? And, what possible sources of inteference cause problems with this equipment? I have done a good bit of searching for other cases like this, but have never found one exactly like ours. So...at this point we are giving serious thought to getting rid of DishNetwork. Any sugestions, or possible sources of information on solving our problem would be greatly appreciated.