have dish 500; one receiver is a dish 311; second is dv3 mpeg3 JVC when I turn off system at night, it loses satellite lock. have to manually point dish and enter satellite and trasnponder. works most of the time, til you change channels and then you have to do it again. This is the old dv3 that is losing lock; have signal strengths over 100 so doubt out of alignment. check switch is ok. suggestions?