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Hi, my car recently developed a very weird problem, i searched for similiar topics, but didnt find any.

Sometimes (i'd say about 15% of the time), i turn my key to start the car like always, and its attempting to start for like 1 or maybe 0.5 sec and then everything shuts off (nothing going on at all). i give it a few sec and try again, sometimes it starts, sometimes there's a weird noise coming from somewhere (not engine) in other words its not attempting to start the engine but its some sort of knocking noise or something and in other cases i just turn the key and nothing happens at all.

Did anyone expirience any similiar problems? or maybe have any clues to what it might be?

Thank you.
Paul.