Hmmmm, lets take this one step at a time. Your on the beta firmware so that is good. it very well could be you plunge rate, what are you using? Start low at about 2mm/s and keeping going up until the problem happens. This is probably the issue.
The last time this happened in the forum the corner of his dewalt was hitting the bearings, so check you clearances.
I hate when people are having issue and I can’t come to your shops and help out. I know these forums aren’t the easiest way but hopefully we get you guys running soon.