Are you using a softener in your home? Sometimes hard water deposits can clog up the cartridges and create the problems you such described. Im not sure about the lock/button issue though since I have never used this particular Delta faucet myself, but with one problem, it can usually cause many others.
Try replacing the cartridge on the Delta faucet first, Here is a link to the replacement one from the Delta site. http://www.deltafaucet.com/repairparts/details/RP50587.html
Here is a link to Delta warranty and lifetime guarantee.
http://www.deltafaucet.com/customersupport/warranty.html
Here is a link to the Delta page with lots of useful information on your product.
http://www.deltafaucet.com/kitchen/details/467-DST.html
Ex-Plumber
Hope this helps-
J.Sper
569 views
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