Hi, I noticed in the past two weeks the water in the shower was pulsating. I thought uh oh we may need a new water heater. It didn't happen all the time though. Now today it seems to be more, and also with the faucets- and the hubby noticed it too. What could be causing this? We have a water heater in the garage and not sure how old it is. We don't have a water softener or anything. Thanks for your thoughts I appreciate them in advance.