I have a Sonicwall TZ400 along with with 3 SonicPoint ACe units / Windows Server 2012 R2 domain. Each Sonicpoint has 2 radios, 2.4ghz radio has Guest / Staff ngb networks, 5ghz is Staff A/AC. Staff networks use DHCP/DNS from our domain controller, Guest uses internal DHCP server.
Up until about 2 weeks ago everything was running smoothly for about 6 months. Then I started to hear reports of "wifi drops." Looking at peoples' computers and ipconfig /all everything seems fine, but I'm unable to ping our domain controller unless I use the IP address. Additionally, SSL-VPN users must use the server's IP address as well.
I'm far from the best with networking but generally have a good enough handle on these things, but I'm totally stumped. Anything computers plugged in work perfectly, so I'm theorizing it's something with the Sonicpoint.
Any...