SBG6580 router modem constantly dropping connections

For awhile now - maybe a couple of months - the SBG6580 router has been dropping signals on wireless devices. I wonder if it's related to firmware. Either I now have an update by cox that made it worse, or it needs an update to fix it.

I can almost always fix it by unplugging and plugging back in, but I shouldn't have to do that multiple times a day.