According to :

Thanks for responding. It's the original faucet installed by the
builder, I don't think it is a pressure balance faucet.

PB faucets attempt to keep the water temperature constant when
hot or cold are drawn somewhere else in the house. I suspect
virtually all show faucets installed in the last 10 years or so
are PB in order to ensure that the water temperature never exceeds
a given value. You can often tell by seeing if there's any sort of
limit stop under the knob with an adjustment screw.

I believe PB devices sometimes get crudded up (with very hard
water or grit) and "stick".

It hasn't
given us any problems for 7 years. We have the typical tank type water
heater. Could it be cross-connected and not detected for 7 years (I
use the shower every day)? We are not getting the "(hot wasn't very
hot, and didn't last long).

The other symptom was that the water temperature was erratic. Without
_any_ other water being drawn in the house, the temperature sometimes
changed abruptly.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.