Appliance Repair Questions? Ask a Technician for Answers ASAP
Hi Colin, this sounds like the cartridge valve has become damaged which is letter water to the drinking tap when you turn on the hot/cold feed, this would also cause the issue of water leaking from the base.
I would be inclined to strip the tap down check all the washers and valves, and refit them, as it could simply be some debris which has got into the cartridge.
How long have you had the tap?