Virtual Machine Manager lose HA IP

Hi everyone, I’m using HAOS as a VM on Virtual Machine Manager, but I’m having an annoying issue.
Everyday, suddenly, VMM lose the HAOS’ IP, and Home Assistant became unaccessible until I force the shutdown and power on again the VM.

How’s that possible?
My dd-wrt router is setted to reboot itself every night at 5:00AM, could it be the problem?
Anyway, it’s impossible that it can’t reach the ip (static) after 10 hours from the reboot…