Bought the Hanover 5 years ago when updating our 20+ year-old kitchen. Love the styling and the overall function. However, it has always had low water pressure, especially with hot water.  And, in the last year or so, the spray head is not working correctly. When the switch is set to stream, it keeps popping over to spray. We've tried soaking the head in CLR to clean out any build up but that has not helped.  I'd love to keep this faucet. So wondering if we need a new cartridge. Or, maybe a whole new spray head?  We would appreciate any advise from Price Pfister.