I highly doubt it's AMP causing the WAN link to fail. Could you provide some more information about the problem your experiencing with the WAN link?
The MX100 should have no problems running all services with 100 active clients, If you're skeptical about the load on the unit, call Meraki support who will be able to share the load information with you.
If you're running a newer version of Firmware on the MX, you can find out the load information yourself by going to organization> summary report and then clicking on "view new version". You'll then be able to see the device utilization graph.
Eliot F | Simplifying IT with Cloud Solutions
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