Virtualization: All screens lose signal after 30 minutes

Hi everyone,

Following scenario: I have built a new system with two GPUs to use GPU-paththrough. One of my three monitors is connected to the Host and the Guest GPU at the same time, so I can switch between my host system and the Guest (Windows 10). After starting the VM, every 30 minutes the monitors connected to the Host lose their signal, but the signal of the Guest is maintained. If I switch one of the host monitors off and on again, all host monitors get a signal again.

It's 100% reproducible, so it's not random.

my setup:
Host CPU: Ryzen 5 2600X
Host GPU:Geforce GTX 1060 6GB
Guest GPU: AMD RX 570 4G
OS: Manjaro Cinnamon
Host Kernel version: 5.3
Host QEMU version: 4.1.0-5

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