Motorola modem resets itself periodically through the day

I have had cox for a while now and this issue has been going on for about 6 months . My modem will reset itself kicking me off the internet and then come back on leaving me booted from the game i played. The outages are vary quick and are just enough to mess up the game im in. I have had technicians come out yet they say they  find nothing.I have had them run new lines, tried new modems , replaced splitters, and finally got a direct line fed to my modem from outside.

Im really not sure what else it could be any ideas?