Do you mean that Host network itself keeps on resetting, like not getting into Internet?

If that is the reason, there are many reasons behind it, all of them Host OS-related, not VMware related. I'm not sure that this is what you are asking?

Well, anyway, if so, here is a list in some kind of likelihood order (not knowing anything about your network or OS or devices):

- router-box one port is failing. Change the port (if wired connection)

- router-box, actually a NAT-box, is in the end of life. They last a couple of years in the average, unless they are Cisco

- your Host network adapter is in the end life (over heating, perhaps)

- somebody else is competing with your wireless channel

- drivers on your Host are faulty (this really can interrupt the network in regular intervals)

- somebody has added a new DHCP-server ("accidentally", having no idea what he is doing) to your network, like from a mobile router (shouldn't really interrupt in regular intervals, just once in awhile)

- your wired cable is loose or under a bed/table stand

- ISP Name Server is not reliable. Should just block, not do it on regular intervals. Anyway, add the Google name server, 8.8.8.8 to make sure

All of these HAVE HAPPENED ... symptoms can vary.