I have been on Zwift for over 4 years, and since upgrading to a intel core i5 with integrated graphics, I have had nothing but problems. I first reported the Problem to Zwift about 6 months ago, and have had several conversations with their support department. Basically they have advised me that they have a problem with intel integrated graphics, which they are working to resolve. The most annoying thing I find is that it seems entirely random as some days I can ride for well over an hour and have no freezes, today for the first time it crashed twice, first on solo ride (warm up) the second time during tour de zwift. I am persistent if nothing else, and on my third attempt joined a group ride on the Bologna course, this time I managed an hour with no issues whatsoever.