I purchsed a card from Digium about 2 months ago, and I have a question about its usage. Is it normal that after about 1 week of the machine in which it is running on needs to be reboot to return the quality of the phones on the card. Becuase after 1 week, the quality drops dramaticly, and a simple reboot fixes the problem. Quality as in audio levels slowly drop, and distortions during a call. This card is used in a remote office and is used constantly for 14 - 16 hours a day.