- Is the name of the machine in use by another machine?
- Conflict of IP addresses. DHCP servers can dynamically add a host name to the DNS servers. When you switch between static and DHCP assigned IP addresses, you may have got name conflicts in the DNS servers.
- ESXi generates a MAC address for the network adapter. Could it be that the same MAC address exists for another guest in your network (maybe on another ESXi server)?
- When you use gigabit network, there could be problems in negotiating the frame sizes. This also causes intermittent periods of non-responsive network. However, these periods should be a few minutes, not as long as the 15 minutes you mention.Try fixing the MTU at 1500.
Issues related to configuring your network
Did you check the following:
I checked the mac addresses through a program called Advanced ip scanner and i got the result of same mac address for both esxi and the vm running withing it. I made sure to change the address the vm is using but there is no difference on the output mac.