Since the installation of the 1.4.96 version in a Linux guest, Virtualbox will occasionally crash. There is no clear indication as to what may be the cause. Hardware acceleration is switched off. For me it happens once or twice a day.
I’ve reverted to 1.4.95 today. No crashes so far.
Version 1.4.95 Chromium: 80.0.3987.122 (Official Build) (64-bit)