Hey Glen,

It sounds like the culprit here *may* be a NAT issue with your modem (where it's having a problem with the number of pings being sent).

If you're sending over 250,000 pings a day (3 targets @ 1 second each = 259,200), the NAT router has to store each of those so that it can route each one back to the right computer. If the manufacturer didn't test the modem to this scale - it *may* be holding on to that information until the state table gets full (at which point it would get confused, and wouldn't be able to figure out how to forward any additional pings).

There are a few things you can do to try and resolve this. The first option would be to check and see if there's a firmware update available for your modem. If everything *is* up to date on the firmware front, then you may want to check into your modem to see if there are any options to configure ICMP settings (to account for the number of pings being sent out).

If neither of the above two options seem to get things working as expected, you could possibly look into manually clearing out the state table on the modem (which would prevent you from having to power cycle it to get things working).

Hopefully this helps out! If you should find yourself with any questions, or needing any other assistance - please let us know.

Best wishes,

-Gary