C7000 keep losing connection even though signal strength is good.

Hello everyone, I am looking for help and I am hoping I can maybe find some answers here. I have the C7000 Modem Router and just two nights ago, my network connection just dropped in the middle of a game I was playing, it came back on and I thought "Ok, this has happened before and it'll be fine just like the other times". After the first drop, it came back on for 20 min and went again. This kept happening to me the past two days at least. I had someone from Spectrum, my cable provider, come and check what the problem might be because the signal strength was low at the beginning. They did some work, removed some cables I didn't need and the signal strength went back up. Just 40 min after the tech left, I lost connection for 10 min. I got it back again and I lost connection after 30 min. Once again, we get it back and it lost connection again after I'd say an hour and 45 min. Its been on for almost 2 hours and no connection lost. I have reboot and done everything, I just changed channels cause I read it was reccommended if you are losing connectivity. So now, I want to see what the public thinks of this and if anyone has had any problems like this. Or if there is anyway I can check to see if there is anything going wrong with my modem router (It is also updated to the latest firmware). Look forward to hearing from some of you guys, hoping I can find a fix to this mess. Thanks!