Clio 2 sometimes doesn’t start

Hello everyone, I have another current problem with my Clio 2 1.2 16 V 75 hp. Year of construction should be 2002. It started when he started the third time. Error read out, OT dealer exchanged. Then he ran clean. A month ago my mother wanted to leave but he didn’t start (trying with both keys). Starter spins, but doesn’t want to start. So ADAC called, he measured the front (unfortunately not seeing everything because I had to start). The car started then. and he ADAC employee said the main relay + ignition coil would have something. I then had exchanged. Couple of days later, again start problems, but he went on. So to the workshop error read out nothing found. Now a few days in the evening the same game, does not start again. Acquaintances called (a workshop) wants to look at this the next day. I thought, try it again the next day and Zack jumps immediately. Do you have any tips? Thank you.