Hi, thanks for the replies. Im on El Capitan 10.11.5.
I'm thinking the USB shutting down on sleep is the issue. It always works on reboot and now that I'm looking out for it I think it drops when it goes to sleep. I will monitor properly and feedback here.
@Andy TV - if I'm reading that right the solution you link through suggests it doesn't allow the HD to stop spinning, but I could be wrong. Im on a SSHD so maybe this would be an issue?
I might change the power saving settings for when Im in the studio and see if that sorts the problem.
Thanks to everyone who's replied - I will feedback here if amending the power saving settings makes the problem easier to deal with. Seems logical so theres hope.
btw - where are support on this? Getting on for 2 weeks now and no suggestions from them. Im new to KPA but seems poor to me.