I'm seeing something similar. Are you using Crowdstrike as well? I have
only been able to get my systems to reliably fail on HS with EPO, Threat
Prevention 10.2.3 and crowdstrike installed. I'm working with all 3
vendors to figure it out but it looks...
I'm seeing the same issue and it is driving me crazy. I thought it was
an issue with the update to SIU but not i'm not sure. It is definitely
an issue with 10.10.3/Server 4.1. I was able to build and boot to images
with the new MBA13/MBP13 no problem...