Hey I'm very new with phone systems so please bear with me.

We have a Mitel SX50 phone system at a hotel with 4 trunk lines. We had verizon before and everything worked great. We switched over to time warner cable about a month ago and now we have calls dropping (after 1 to 30 seconds) but the problem only happens at night. The TWC technicians came and checked everything saying everything is working great on their end.

Do you guys have any idea what the problem could be?