There is a known issue with the 16dlc's. Panasonic will replace them for free. In fact, they have sent us a supply of them and requested that we change all cards pre-6C in the field.
I also had a 8DHLC blow today and took the switch with it. It's the first one I've encountered.
There is a tech. bulletin out there regarding the 16DLC's... I just don't have it in front of me.
If you have cards pre March '06, replace them now. Your customers will love you when their switches don't go down.
The updated "good" cards have red dots on either side of the s/n on the card itself.
