No signal ⇐ Hotpoint-Ariston

[Helga]

Good afternoon.
Dishwasher hotpoint-ariston
A problem with starting began to appear periodically.
After closing the door, a sound signal should occur and the program should start (pumps, etc. are turned on).
But sometimes this sound signal does not turn on after closing the door and, accordingly, the machine does not start.
The machine does not produce any errors. The technician came, checked the lock, contacts, pulled the door - he said everything was ok.
The machine does not work stably, it can turn on for a week, then it starts to stall. You have to turn it off and on, open and close the door, and sometimes this helps. Sometimes when I run out of patience, I leave it on and forget. It may turn on itself after some time, or maybe not. If it starts, then everything is ok, it washes, heats, dries, drains the water.
Another observation: sometimes, when filling up with water, it abruptly cuts off the supply and freezes, then comes to life again. The same thing happens during washing. I hear that there is an active wash, then a break, a pause - start, a break and a start, the number of interruptions and pauses is different. It happens that because of this it can take 2 hours to wash instead of 40 minutes.