The issue seems to happen primarily when I am at work and not at my house (I usually connect to WiFi from home -- unfortunately CVS does not have WiFi); I changed the above settings while at home and now (at work) the issue has disappeared. AFAICT, my time was set correctly previously so I am not sure if this is what fixed it, if there were issues with my carrier that have since been resolved or if theymos changed some setting on his end.
I tried googling TCP RST and was generally unable to find useful information that might help determine the root cause/a possible solution.
Thanks.