Hello,
When scanning using nmap in Kali Linux, which is running in VirtualBox, while the host OS (Windows 10) is using a VPN, the internet connection in Kali Linux drops during the nmap scan, usually closer to the end of the scan when nmap has already scanned about 70%. The network settings were not changed, and at the same time, everything works fine on the host OS: both the internet and the VPN are functioning properly. After rebooting Kali Linux, the internet connection is restored. When using the TOR network (Whonix Gateway + Kali Linux), everything works fine and the internet does not drop.
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does your vpn provider allow you to do port scanning?
you can use nmap on windows to test this.
you say after rebooting kali the internet is restored, does your virtual machine have enough RAM allocated for Kali?
virtual machine settings should ideally be no more than half your physical CPU cores or the same for RAM, on a windows host maybe even less as Windows itself uses a lot of resources.