Internet drops for 30-45 seconds throughout the day for last two weeks

Looks like T3 time-out errors, probably from the noise on the upstream the tech hasn't isolated yet. My guess is you got the upstream OFDM channel around the time you had these problems. I would suggest emailing Cox at cox.help@cox.com with your account info and a link to this thread and ask for a update. Hopefully someone will be able to track down a ticket number for the work. If not, they may have to start all over again.