Recently, I noticed that the water flow out of my shower head pulsates for about 15 seconds or so before a normal steady stream of water is observed. It doesn't do this all the time, but seems to be the majority of the time. It's a single handle pfister pfizer and the spuddering seems to be more pronounced the further to the hot side I move the handle. The first time it happened, I figured someone flushed a toilet or was running water somewhere, but this wasn't the case. Please advise on what might be the issue. Thank you in advance.
-Segal
-Segal