Home internet cutting out

It's been an issue for almost two months now that the internet is constantly cutting out multiple times a day. I've done everything to try and fix the issue. I've had multiple technicians come to try and fix it, I've changed out the modem multiple times at the nearby Xfinity store, I've made sure every cable that has to do with supplying us internet is intact and in the right place. I'm desperate for a solution as I work from home and have been written up because of the connection issues.