When I first got my Simona Top it was doing similar things to yours. The electronics unit co-ordinates everything in the machine. I replaced the electronics and it came good.
Considering the weirdness of your problem, I would suggest something on the electronics unit has failed.
On that topic, I need some of the hardware replaced in mine, and Brugnetti have stopped supporting that model.
If you were at a point of getting rid of it for parts I would be interested in buying it from you.
Let me know how you go.