XDJ-rx when using auto loop buttons - loop always speeds up - every time !!

so - when I loop the speed increase by about 0.2 bpm -

really annoying 

as the looping  doesn't work right without constant tweaking of speed

 - I've tried adjusting beat grids etc - no jopy

it happens every time so I"m guessing a software issue - 

Im using pro link mode 

please help