Renault megane grantour 2 inboard electronics defective

Hey guys. I have a problem with our renault megane grantour 2 bj 2003. With us the in-vehicle electronics always start. Not always, not always at the same time punt, sometimes not at all. Sometimes directly at the start. times during the ride. It is totally curious. fuses in the car directly all in order checks in the engine room and also everything in order. I bought a new battery. What can it be about now? ?? HELP. The youth workshop with us in the near he has deleted the bug word once completely but not read out. I hope you can help me many times LG nicol