Hi kenca.
I note you are creating a new thread on the same topic each time you post to the forum. Please find your original question and use the buttons in it to continue that thread while discussing your same issue.
We are all running the same software and yours is the first time this issue has been reported. Thus while you could indeed have found a bug, it is more likely that
1) this will be corrected by running a scan disk as I described for you ( can you confirm that you did this and it did not help).
2) if Scan Disk did not help, your playlists are corrupt because while creating or editing them, you were using the B2 to play or load music at the same time. The B2 can get confused if asked to do two things at once. Create a new short playlist and try playing random from that to see if this too manifests the problem.
Fred