Samsung Water Wall 7E error

I’m getting 7E error and grinding noises at certain points. It used to wash for a while, then stop with the 7E error. I checked that the water wall part that moves was attached properly and oriented correctly. Ultimately, I replaced the motor/sensor assembly. Now, when I start it, the water wall cycles back and forth, making a grinding sound when it gets all the way to the back (I think) and then displays 7E before even starting to fill. I can’t find anything binding. I removed the water wall track and it moved smoothly. I saw people on the internet saying that there is a problem with a magnet getting weak from the heat and no longer activating the sensor at the end of its travel. Could this be my issue? How to resolve?