keep disconnecting if i tab out of game and try to rejoin it

i only have 1 monitor and have to tab out to check a guide now and then. but now ever time i tab out the game crashes and back to steam start. anyone got any ideas what might be the issue
amd ryzon 5 3600 6 core
gforce rtx 3070
16gb ram
rog strix b450-f gaming motherboard