OK, your links explain your matter better - originally, Host OS was not mentioned. 

Not sure, if those links explain a real, generic, case, though. Why would DHCP-address be renewed in a live system? Never seen anything wrong in VMware, because of that (using VMware 15+years, in Ubuntu and Windows, lately in Kubuntu and Ubuntu Studio) in large corporate networks and elsewhere.

It seems like a faulty DHCP-server or its configuration. Often times, in corporate networks, you can ask for a long lease time (weeks) for an ip-address. That is often also a requirement, because of some licensing software. You may even ask for a DHCP-server never to change your ip-address. 

In your own networking, there is no need to use a DHCP-server, you can just as well use a static address, because networking is in your own control. The problem may arise when moving the computer between networks - which isn't really that common these days with limitations of all sorts.

Not sure, what this DHCP-server ip-renewal means in a live system? Normally, it only changes ip during the boot, IF it changes at all. If this is a specific case in a certain corporate network, THEN, I realize that you do have a problem. Sorry, I'm not a security-guy and do not know about all the specific networking arrangements that may be enforced for end users.

However, you say that the problem is also with a static address of the Host, which, if true, makes the writing above mute. Since no such phenomena are happening in a standard case, not in Kubuntu 20.04.2 or Ubuntu Studio 20.04 anyway (I have tested briefly many others), the problem is perhaps in something, which is not standard for Ubuntu, if that is what you have. I need also to add that I'm not using normally a static Host address. With normal, home-use, boxes (Zyxel, D-link, TP-link) I have never seen such a problem, in wireless or wired connections ... so, not a general case.