Why is the virtual machine constantly losing its ip address?

Question

virtual box

Good afternoon. There is a virtual box, ubuntu lts desktop is raised on it. Latest updates are worth it.
The virtual machine periodically loses ip. In the information about the network connection, "ipv4 ADDRESS is unknown. This happens every 1-3 days. The virtual machine is configured with a network bridge. After a reboot, everything is restored. I do not turn off the main computer, it does not go to sleep. What could be the problem
? in the network card "turn off the device to save energy" removed
Ideally, it should be like this:
I leave the computer, Windows works, the virtual machine works, the permanent static ip address does not disappear anywhere.

Answer 1

cat /etc/network/interfaces - exhaust?