I Replace water filter each 6 months.
Tube that feeds water to ice maker freezes up. Water flows so slow that it freezes in drip cup. Ice continues to build in tube until it becomes clogged. Suspect something is causing the water to flow to slowly. (Water dispenser may also be running slow but it has happened so gradually, I cannot decide if it is slow or I'm being impatient.)

Thanks for the response. Qustion before I begin. I'm assuming the hook up was originally done correctly since everything has been fine for years. Having said that, the line connecting the fridge to the valve in the wall is plastic with brass fittings at both ends. Should I remove the source fitting first to check for some kind of build up. Is that the the goal? And, if not at that end, should I check for some kind of build up ant the fridge connection point.