Bathroom Exhaust

The exhaust fan in my bathroom sinks in the bathroom floor at all times during the winter. I had a turban new roof vents installed where it thinking it would resolve the problem by allowing the condensation to drain through the roof, but it continues to flow through the exhaust fan in my room and bath. It flows so the fan is running or not. It's very annoying because the fan is located in the ceiling in front of my sink and I can not stay here without getting water flowing in the back, not to mention the damage it does on the floor and my carpet.
Suggestions?

The above answers are good. Also, please consult your owner's manual for your fan, or customer service contact manufacturer.

Make sure the vent is isolated and also if you replace the vent tube try to use something with a smooth interior as galvanized or PVC evacuation. The ventilation hose tends to have more back pressure and does not move the humid air and a more rigid and smooth breathing tube.

try to isolate the pipe that vents to the roof to stop condinsation
also try to see if Thair is a component that opens when you turn on the fan and should be completed after his cut-blocking hot air to get to the pipe wile not in use.

The warm moist air from the bathroom is cooling and condensation in the vacuum hose. It sounds like the pipe goes up and condensation is collected on the inner walls of the pipe and running down in the bathroom. You can try to misuse of the pipe so that it rises just enough to remove the insulation, then head to the side of the attic space with a gentle slope down to the water either outside .

The drip that you mentioned is a result of condensation collecting in the duct that connects the fan to the roof opening. You must check the pipe and possibly the use insulated hose or check valve in the fan to ensure it closes when the fan is off. For some reason, the cold air is in the pipe and cause the flow of condensation. The hose can be detached from the roof?