its show rendering device has been lost! Application closing
i use rtx 2070 how can i fix this problem
First, check the Known Technical Support Issues - Updated Oct 13, 2021 - #19 by Drakuloth
Second, check your Windows Event Viewer > system logs to see if your GPU drivers are crashing or another hardware related issue.
Third, if you cannot resolve the issue, post a dxdiag here. Blizzard Support - Obtaining System Files