The windows VPN method is plagued with constant problems. Just when you think you have it right, Microsoft changes something or an update resets your settings and breaks it. as @cwal21 mentions Anyconnect is now available for Meraki, switch to that. You have many more options for managing the VPN well, and most people are familiar with anyconnect from a user standpoint. Update the code on your MX's and give it a try, if you don't have a ton of users the anyconnect licensing isn't too bad price wise.
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