I'm having intermittent issues on a few machines after upgrading from Secure Client 5.0.x to 5.1.2.42 and upgraded the Umbrella roaming client to the Umbrella module. I even removed everything, reinstalled just the 5.1.2.42 VPN core, and the Windows 10 machine still can't resolve hostnames, just the root of the domain. I see the DNS query in the FTD connections logs which is allowed. For now, I had to make host file entries for all the servers then installed the Umbrella module, SBL, and DART so the client's protected. When it does work resolve during a ping, sometimes I ping it again it comes back as Ping request could not find the host xxxxx. Please check the name and try again. Flush the cache, root of the domain still works fine, just no hostnames even if I enter them with FQDN.
