Friends , I am with a ccr1036 running server pppoe with OSPF . She is restarting roughly every 4 hours of use. It is at version 6.35.4 . already I checked all settings and found nothing . I have already put the last version 6.34.6 and changed nothing .

Can someone help me?

Please generate supout file on your device after it has rebooted itself and then send it to support@mikrotik.com with proper problem description. We will look into this.