For the second time in the last 2 years, our unused bathtub faucet has suddenly started leaking. We never use this bathtub or shower. In the last few hours, enough water has come out to fill two large buckets. It happened before, more than a year ago, then stopped. I found a tub full of water, so I do not know how long it had been dripping. Nothing for a year+. Tonight, it has gone from a slow drip, now increasing to a steady low flow. Any suggestions/input from the experts? Thanks so much for your help!

How many PSI is your pressure where the water comes into the house? Usually there is a ball valve to shut the water off. Your description tells me that there is possibly debris in your water lines that needs to be flushed out. You could have debris in the tub valve that needs to be flushed out. If you don't have a pressure regulator and your pressure is over 80 PSI on your system I suggest installing one. Good luck

A "random leak" would be hard enough to diagnose if we were there, but impossible to diagnose over the Internet. Now that it is leaking constantly, a plumber can determine the problem, probably a bad washer or cartridge, and fix it.