I haven't been getting noticeable spikes, but initially my keyboard shortcuts were been dropped out as I interacted with the software - Blue 2.0, TH2, have both done this too BTW. However, after the first fix, this seemed to stop...or mostly anyway...what I then found was that the timeline started stopping, even though the track kept playing...after 4/5 bars, the timeline would suddenly 'catch-up'.
I sent a basic project to XLN's support, and they found a 'glitch', which was then sent to the developers...I've been waiting for a fix to this, otherwise I was just going to refund it, as AD1 works flawlessly. I guess I'll try the update and see if it does the trick.