I have been using Parallels for years, and WAS quite happy, HOWEVER, in recent months I am constantly freezing, and the only resolve is a Windows reset or a power down. For a while I was thinking maybe it only happened if I left windows running overnight, but such is not the case. It sometimes happens after only running for 30 minutes or so. I'm using a MacBook Pro 15-inch 2017, 2.9 Ghz Quad-Core i7, 16GB 2133Mhz LPDDR3, 512GB eDrive with 34GB of free space