Connection Issue: Randomly disconnects throughout the day

I'm trying my luck here. I had called and had technicians visited me several times now. They had replaced the line outside and rewired inside the house as well. I also bought a new modem to rule out the possibility of a bad modem. But issue still exists. This is very frustrating that they have not solved this yet. Please help. Thanks.

@ComcastJoeTru 

@ComcastAmira