WIFI connection/disconnect issues

      So we got cox and i was recommended to it by a friend and so  i trusted there word. well i will try to stay on topic and not list the other problems. it started a week after internet got hooked up my wife just bought a brand new laptop and she wanted to use the wifi  she connected and it all worked well for about a week or two. she is not one to complain. and she didn't tell me about the issues till about 2 months ago or so. wifi keeps dropping and i have to reconnect it manually every time through the internet settings. and it started getting real old real fast so i called a couple of times about the internet was told that it might be some interference so i  was told to try it in another location so i moved it to a few spots in the house where the jack was available and active still getting dropped. i was told everything seemed fine on there end but it isn't fine. cause i still cannot use my new laptop new cell phone  and new ps4  cause every time i connect via wifi i get dropped after about 5-15 min.  and i understand the traffic issues but this is unacceptable i pay you to provide a service now start providing. if it seems like im upset i am cause the internet is not the only issue but again any help would be appreciated.

your modem we are renting:

CISCO model: DPQ3925