we also have been thinking of this issue, but it could be solved by replacing new one all the time.
So I have checked the defected parts with our machine but they were good.
For this reason, we tried to reuse one of them to other machine which had the same problem last week and it was no problem for 3 days.
After that, we put the original defected part back again, and it worked as we expected.
In this situation, We presume that the electric insulation is broken by humid compressed air for cooling, but we think it cannot be measure mega ohm such as very low values with a normal multimeter we have.
We wish I could open and dry it whether it works or not with your permission. soa natural?

We have also been thinking about this issue. It could be solved by replacing new ones every time it happens.

I have checked the defective parts with our machine, but they were good.

For this reason, we tried to reuse one of them in another machine that had the same problem last week, and we had no problems for 3 days.

After that, we put the original defective part back in again, and it worked as we had expected.

We think that the electric insulation is being broken by the humid compressed air that is used for cooling, but we cannot measure it with the normal multi-meter we have because it has very low values.

If you give us your permission, we could open it up and dry it out to see if it works or not.