I have a new office setup where I have an ER605>Netgear Managed Router>DLink Managed Router. I have had clients connect to vlans that are passed through this layout all day and randomly they will lose their DNS. Their IPs stay on the network and look good but they randomly drop offline and we are getting no dns errors from the clients. I have reason to believe the issue is coming from the DLink switch but I wanted to post here and see if anyone has encountered anything like this. We dont have that many clients >50 but we have around 15 different vlans spread out across the network. Thanks everyone!