It sounds crazy - but after about 7-8 years of owning this refrigerator this started happening to me. The problem seems to be a faulty seal on the filter. I tried multiple brand filters including the OEM Whirlpool ones. I have tried o-rings and multiple do-it-yourself fixes. I finally found a way to make it work but it is going to sound crazy - and is not an exact science. I smeared petroleum jelly on the filter and the connection and that corrected my problem it is a temporary fix and I had to apply a couple of times in the life of the filter. Whirlpool should definitely cover this but they won’t. Good luck - because like I mentioned - it is not an exact science. You just have to apply the proper amount to seal out all the air.