I am a HVAC service tech and have not worked on ice mech much. We have a ice o matic mech in the shop. Model ice0400ha2.We bought in 05. four years ago I started getting metal flakes in the ice. Got a new grid under warranty and replaced it. Now the new one is got the nickel plating flaking off again. We have cleaned it about once a year with nickel safe cleaner. Has anyone else had problems with this model. Any suggestions on how to stop it from flaking the nickel off. We use it mostly for ice chests.