I had a 722K installed about a month ago. I have it connected to a landline telephone line. Ever since I had it hooked up, my telephone rings with one ring in the middle of the night around 3am. Nothing is recorded on caller ID. This happens a couple times a week, but I don't know if it happens every night and I only hear it a couple times a week, or if it actually only happens a couple times per week. I checked my receiver and around 3am is when it does the calling out, so I'm beginning to think that this is not a coincidence. Have there been any other reports of this and is there a way to fix it?