Modem disconnection issue

I've had Comcast for years and never rarely had any issues or disconnections. On the 13th of August, techs came out and the app said there were upgrading equipment in our area. My Internet was spotty all day but came back about 6 hours later. Ever since then, my Internet goes out about every 5-6 hours for anywhere from 2 minutes to 2 hours. I've tried restarting, checking cables, I've tried different outlets, still the same result. I'd rather not have a technician come out, if possible...