I mentioned a possible troubleshooting step for the network problem here:
You mentioned that you tried:scottgus1 wrote:I would ask you to install another guest, Bridged to the same network adapter as your present guest.
I took that to mean you installed another Virtualbox guest with a router OS (like pfSense, for example) to run side-by-side with your present guest and it didn't work:anil.kumar wrote:Installed a new OS for router
I guess I misunderstood. This was apparently a firmware upgrade for your network router, rather than another Virtualbox guest.anil.kumar wrote:Installed a new OS for router (I was anyway planning to do that). Still didn't work.
So I will re-request the "new guest" troubleshooting step, as mentioned above. Please install another guest, and monitor its netowrk connectivity when the first guest looses network. If the second guest keeps network when the first loses it, then the problem with the first guest is in the guest OS itself.