I know it is weird for 250 to have any bugs because it is perfectly simple mixer, and I am questioning myself about this, but I want to share my experience, maybe someone noticed something similar.

Last night when I connected CDJ-850 on DJM-250, I pressed play on CD player, and there was no sound. I checked out cables, inputs, player, file, everything was fine. Sound came with 6-7 seconds of delay. It happened one more time later on same CH. It was weird bug, I'm still not sure if it was mixer or player, but 90% percent shure that is mixer, because I noticed this bug few weeks ago when I worked with CDJ-350 (I think), and I thought it was some rekordbox random bug, but now I think that it's mixer's bug. It happenes when I switch on mixer for first time.

p.s. Cables are fine, all MP3 files are checked so there is no way that was an error.