I’ve tried to find if someone have the same problem and found only somewhat similar theme. But it crashes not only while downloading and after 3-5 seconds after launch. It happens with Wine Steam launcher or with Steam installed in Wine launcher and only with Lutris. If I launch Lutris from console, then Steam and then it crashes I only get:
$ lutris INFO 2018-05-01 21:26:33,505 [lutriswindow]:Connected to lutris.net as Kuriot WARNING 2018-05-01 21:26:58,146 [thread]:Processes are still running WARNING 2018-05-01 21:27:38,513 [wine]:Some wine processes are still running: 4991
It’s on Manjaro with KDE.