sampler looping problem

I have loaded up the sampler in Rekordbox with some looping samples that I want to use in non latch mode - i.e. hold the button to play the loop continuously until I release the button.

After closing and restarting rekordbox some of the samples no longer loop - they just play once and stop even though the loop mode and trigger mode are still set correctly - clicking on the gate mode button gets them working again but I now have to go through 32 samples settings each time I start rekordbox to make sure they are looping correctly.

Any ideas?