Water filter question
WOW! I'd say that the filter is definately due for replacement.
The manufacturer recommends the filter be changed every 6-8 months, as with ice and water dispensers in the door, folks tend to use the chilled water and ice more often, hence you get alot of gallons of water thru the fridge each month.
Once you replace the filter, you'll need to flush out the lines, (see the instructions with the new filter) to get rid of any loose carbon in the filter element, but once you done this, you should also notice better water flow and better tasting water and ice cubes too.
I tend to change my ice/water filter on my fridge every year when I change my smoke detector batteries. That way, I don't forget, sort of like my personal "once-a-year" house task list to change batteries, filters, resetting timers, etc., etc.
It's a good idea to change these smaller filters at a minimum of once a year, as they are no longer providing the filtration you want, and can actually be letting some of the contaminents fow out and into your water and cubes.
Hope you find this Very Helpful and best regards!