Do you have to connection 'Nailed-up"? If not, make it so.
Do you have latest firmware on the unit? According to this page »qwest.centurylink.com/internethe···are.html
the latest is "QZP002-3.4.012.0"
Are you using the PK5001Z as modem only? Do you have another router in your setup?
Or is the PK5001Z being used as modem/router?
As for the packet capture, there are basically several ways to do it
1) If the device itself supports a packet capture the use that.
2) If you have a managed switch or true HUB, place it between the modem and router and use the sniffing port capability to capture the packets (assuming you have separate router and modem and access to managed switch or true HUB).