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It is very random, but my panoramic modem/router will just drop internet connection. This started about 3 months after I started service with Cox. It may happen 5-10 times in a row, or not at all for days. It is very frustrating as I use my computer for work, I've contacted the cox office near me and they show that my modem will randomly disconnect, but they have no clue as to why. When I had my internet set up, the tech had to run all new wiring to my apartment, from the street so I know that the wiring isn't bad. The coax cable seems to be in good condition as well, with no obstructions in the connector.
I have the same problem!