Virtual machines (QEMU/KVM, started from virt-manager) are often just black, have to restart computer for them to possibly work

Whenever I launch my VMs, if my laptop has been suspend at some point, it just won’t work, and the VMs will be black.

Even after a restart, sometimes if I restart a guest, it will still be black until the next host reboot

Anyone knows what I can try, or what’s causing this ?