Regular failure Siemens EQ.9+ percolation unit

My Siemens EQ9 + coffee machine often gave me messages about the brewing unit to be cleaned. The more I cleaned it, the more often it broke down. It turns out that the successive and numerous cleanings end up degreasing the whole mechanism and that the motor ends up having trouble doing its job. The solution that I found and that works for me was to clean well with a toothbrush all the mechanical parts in movement by operating by hand plastic screws, cogs, piston, then to grease well all these moving parts with a grease spray (WD-40 specialist). The result was effective immediately and I have no more breakdown. It is thus necessary to avoid washing the device too much with degreasing products... Easy no?!

You sprayed the brew group, which comes into contact with food, with WD-40 specialist?
Very brave.
There is special, food-safe silicone grease for fully automatic coffee machines.