Delays showing playlist and changing buttons when DDJ-800 connected

If I just start Rekordbox 5 then clicking a playlist shows the song immediatly.

But after I connect the DDJ-800 there is a one second delay when clicking a playlist before the song list is updated. Does not happend with my DDJ-400.

Also when using the DDJ-800 pressing the "CUE" buttons for previwing in the headphones sometimes takes a second before the button lights up.

Happends both on my laptop (where Rekordbox uses 50% CPU) but also on my desktop where Rekordbox only uses a few % (hardly visble on the RB display).

Any ideas why these delays happend?   Is this fixed in Rekordbox 6.x.x?

PS!  Delay starts after playing the first song (but stay after stopping song).

PPS!  All music related functions (jog, cue, play, fader etc) has no delay