We have had a Glacier Bay kitchen faucet, model 785-564, for about a year. For no apparent reason today, when the handle is pushed back to make the water hot or warmer, the faucet just shuts off. It is a gradual shut off as you push the handle back. This model is a gooseneck pull down sprayer style with one handle, one connection. We replaced the cartridge to no avail. We took out the regulator ball in the check valve in the black hose going to the pull out hose after contacting Glacier Bay just before they closed tonight and was told to do so. Still no good. Any ideas?