When I went to do a signal test this morning, I received a message that it would interrupt a download from 1010 (showcase). When I used the "yes, interrupt" prompt, the box went into the signal test mode, but when I left the test mode and tried to tune a channel, I got another prompt that both tuners were busy and to choose a tuner to tune the channel. When I try to acknowledge the "tune channel" prompt the screen goes black and then goes into the same prompt again. The only way out of this loop is to do a reset. This is the third time in a month, but I didn't figure out until today it was because it was downloading a showcase item. I didn't have anything set to record at the times this has happened. I am running 18a and yeah I think I have to check the signals everyday. Has anyone else had this issue?