I’d say 90% packet loss and a 15-sec (not msec) delay is pretty indicative of a major problem on hop 6. This looks very much like the problem that WAVE customers were having HERE. The problem there was that WAVE pushed a port security configuration change on 13-Aug that caused Blizzard’s servers in Las Vegas and New York City to reject incoming packets. WAVE reversed that (for most customers) a day or two later and most players had their issue resolved.
Check with Cox about whether or not they might have changed port security configuration. If you own your own modem/router, see if you had a recent software update that would have closed off ports that Blizzard games use. Also could be a software firewall issue with your anti-virus program (if that updated recently).