I had the exact same problem on my 705 which I had been using for about 6 months. It had something to do with the auto pause feature, which had initally been set up correctly. The thing just got stupid (stupid computers!). My DH did a "reset" of the unit and it's worked perfectly since then. If you'd like more info on the reset I'll have to ask the DH since he's the expert on the 705.

Carol