Packet loss in San Diego, CA

I have been experiencing packet losses since February. I have been ping testing with CMD every single day and have noticed that these packet losses I have been getting are completely random. It can last about 1-5 mins to 1-6 hours. I have already contacted COX a few times already and they don't see anything when pinging the modem/router. I have checked the cables on my end, none of them are faulty. Resetting the box and router do nothing. They even gave me a new Modem/router just about a week or 2 ago and this problem still persists. Getting work done is getting to become impossible with these packet losses. I even sent an FCC complaint and haven't heard NOTHING back at all.