Bugs...but why???

1 - Rekordbox updated to 5.0.2

2 - XDJ-RX updated to 2.21

---now---

The differences:

REKORDBOX:

1 - Cover art disappear after pressing a keyboard to jump at start of the list when browsing (export mode)

2 - INTIALKEY tag won't load from M4A files - before update all was ok

XDJ-RX after 2.21

1 - Some MP3/M4A not stay in sync...but it doesn't depend from a corrupted or strange MP3/M4A but only random error...necessary to push "sync" twice. Note that the white light is fixed...never blinking.

2 - First of the "improvement" i was be able to use my XDJ-RX with rekordbox DJ  in performance mode and use 4 decks simultaneously, after updating, only 2 deck at time...why? If try to press deck1/2 button, in midi mode, the music from the deck 1/2 or 3/4 stop immediately. Why?

And...for the first time, (after updating)...before start my gyg, music stop, XDJ hung up and freeze, was playing a mixed tracks over 100minutes. This appear only 1 time and "maybe" after reformatting my stick this should be resolved? ....maybe.....i hope....!

Thanks all.