Crash during 1st record DJJ RB

Hello :) I have just bought a Pioneer DJJ RB controller and installed Rekordbox. Yesterday evenening I had a session of 2.5 hours straight. Today I started up and Rekordbox crashed during the play of the first track. I mean that the record was stopped playing and also my DJJ RB did not respond with the play button. I could use the Searsch function of the controller and navigate through Rekordbox. When I restart Rekordbox I regain the full functions of the controller but it keeps crashing during the playing of my first track. I reinstalled Rekordbox, but this does not solve the problem. Any helps?