Packet loss on Twilio only

We use a cloud ACD provider and they use Twilio as a voice provider.  We are finding that all of our Agents who have AT&T Fiber at home can not take calls consistently. We installed PingPlotter on their machines and are running three traces.  One trace is to a local server, one trace is to the ACD provider and the third trace is to Twilio (chunderw-vpc-gll-us1.twilio.com).  We see that the trace to Twilio experiences 80% packet loss, while the other traces do not experience any notable packet loss at all.  The pattern is - 10 - 30 minutes of 100% packet loss, the IP address then changes and you see one minute of no packet loss, then the packet loss starts for 10-30 minutes again.  Sometimes the IP address changes and there is no affect.  Sometimes the IP address changes to an address that previously resulted in a minute of lucidity, but does nothing.  We have several people on AT&T Fiber and this happens with everyone who is on this service.  This is not happening with other services such as Xfinity.  What can we do to resolve this?