We've had a similar experience with the settings changing. For more than 3 months, we've been using a pair of Meraki MX65's integrated with Active Directory for VPN access. During this time many users have experienced an odd behavior. The VPN stops connecting, with the connection dialog hung. On another machine I'll verify that VPN is working. When we review the Windows VPN client settings we find that the security setting on the VPN network adapter have changed back to the default settings. Numerous users have had this experience (including myself) and they all say they've not been in the adapter settings, or changed the settings. Sometimes we can get it working by setting the VPN network adapter security settings back to Meraki recommended. Often it works better to delete and recreate the whole VPN client connection, both the VPN settings and the network adapter. I'll give these work arounds a try.
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