As a former services technician i can ensure you the summer heat plays a big role on your services interruptions. During the summer the cables on the power lines, get hot and when they get hot they stretch, and sag which leads to higher latency and connections issues. Also if you live in a neighborhood that is Cox heavy then remember there are thousands of kids home for summer and getting on the internet at different times then normal. This will lead to higher traffic which bottlenecks the entire neighborhoods internet, because Cox customers share lines, and do not have dedicated lines like DSL or fiber. You can also check all your fittings, to ensure they are all snug, and ensure there are not lines in or outside that are tangle or overly bent, as this can also lead to service interruptions or loss of service. I highly recommend you call Cox and add complete care to your account, and request a services technician to come out and assist in fixing your issues. On another note Cox if i am not mistaken doesn't promises services between the hours of 12am-6am,
"Our normal maintenance window is between midnight and 6AM. Advance notice is not always practical; however, we try to let customers know when a major issue or a network upgrade in their area will impact their service for more than one day."