I've been drawing with the vector brush tool using a Wacom Intuos 4 tablet, tracing from a photograph, and the entire application will crash and shut down with no warning. Sometimes the recovery file will have saved everything I was working on, but more often it will have lost my last 2 minutes or so of careful, intricate drawing that I must do-over. This has happened at least 5 times over the last two days. It happens when I'm in the middle of drawing the lines with the wacom pen, not when I'm navigating through the software with colour picker or swapping between cursors. Seems to only happen as I'm drawing the vector lines free-hand. The crash will reset my workspace too and I have to set that all up all over again.
MacBook Pro (Retina, 13-inch, Early 2015)
2.9 GHz Dual-Core Intel Core i5
16 GB 1867 MHz DDR3
Intel Iris Graphics 6100 1536 MB
Affinity Designer updated 2 days ago, v1.8.6
Recently installed the Intuos 4 Driver.