ISP can't reach my router/modem (combo)

[Alphafat]

for the last 5 days or so, my internet was acting weird, disconnecting every 20 mins or so, i had an old linksys router, no clue on the modem, but all of it's about 7 years old, i got a replacement, Motorola SBG6580, my connection is somewhat better, but my ISP says they can't ping my router/modem

 

[Alphafat]

C:\Users\Mark>ping google.com

Pinging google.com [74.125.224.228] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 74.125.224.228:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Users\Mark>ping google.com
Ping request could not find host google.com. Please check the name and try again
.

C:\Users\Mark>ping google.com
Ping request could not find host google.com. Please check the name and try again
.

C:\Users\Mark>ping facebook.com
Ping request could not find host facebook.com. Please check the name and try aga
in.

C:\Users\Mark>ping cox.com

Pinging cox.com [24.248.75.200] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 24.248.75.200:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Users\Mark>ping cox.com

Pinging cox.com [24.248.75.200] with 32 bytes of data:
Request timed out.
Request timed out.
Reply from 68.1.0.5: Destination net unreachable.
Reply from 68.1.0.5: Destination net unreachable.

Ping statistics for 24.248.75.200:
Packets: Sent = 4, Received = 2, Lost = 2 (50% loss),

C:\Users\Mark>ping cox.com

Pinging cox.com [24.248.75.200] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 24.248.75.200:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\Users\Mark>ping cox.com

Pinging cox.com [24.248.75.200] with 32 bytes of data:
Request timed out.
Reply from 68.1.0.5: Destination net unreachable.
Reply from 68.1.0.5: Destination net unreachable.
Reply from 68.1.0.5: Destination net unreachable.

Ping statistics for 24.248.75.200:
Packets: Sent = 4, Received = 3, Lost = 1 (25% loss)