From Eurogamer: “You’ll want to restart The Division 2’s private beta client every couple of hours to avoid crashing, Ubisoft has warned.
The beta represents an unfinished version of the game, of course, so you should expect some bugs – but Ubisoft has today issued a blog post advising players to be careful with two big ones in particular.”
Source: N4G PC Ubisoft advises you restart The Division 2 beta "every two to three hours" to avoid crashing