If it's the modem provided by the ISP, check the firewall settings. My old Verizon one would default to "high" where "medium" (block inbound but allow outbound) would be required for p99 to work.
Alternatively, you can add the ports required as exclusions but the how-to on that has a lot of variables. Hopefully, it's something like what verizon did and has a "simple" and "advanced" interface.
Also - you're sure nothing else changed? To confirm you could try connecting via your cellphone hotspot or something temporarily just to rule out anything besides your new modem.
-Mcoy
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