High pitch sound when pressing pads for first time (DDJ-RR)

Hi,

(Model: DDJ-RR - I have the latest Firmware 1.07 + Rekordbox 5.0.3)

When first switching on the unit every time I have to do what I like to call 'Purge' the controller before switching up appropriate volume levels. 

When pressing the performance pads in any setting, Hot Cue, Effects etc I get a horrible and loud high pitch screech for around 1sec. This also happened halfway through a set when my friend pulled the crossfader across from the central position (as I leave it in the middle most times).

Obviously if playing in a nightclub or pub with full PA system this is awful!!

Minus the 1 occasion with the crossfader it doesn't seem to do this again after the 1 time! Hence when I switch on the unit, I have to turn the volume right down and press random buttons just to get this out of the way!!! 

Please Pioneer, this needs sorting ASAP. I saw in an earlier Firmware update something very similar to this mentioned as a *FIX*.. this obviously hasn't worked across the platform :(

Thanks for your assistance,

Steve