problem with smeg ST 1145?

hello,

my dishwascher smeg st 1145 isn't working properly anymore. after about 45 min. it starts beeping a couple of times, then continues and approx. 20 min. later it beeps again, but this time i can only stop it by opening the door and turning it off. it doesn't finish the program, the water is still standing on the bottom. the leds don't indicate any error. this happens with every program. i had a technician here already, but the only thing he found was that this is a problem with the electronic system and he can't fix that. is it possible to repair this or do i have to buy a new dishwasher?