Did you have to disable NAT-T on the Meraki as well? I am having the same problem with MX84 and ASA5525. Had the drops for approximately a week now, they happen at random... I see a drop between 5-8 hours daily. We have other Meraki MX products connecting to the same ASA without any issues. I don't know why this particular tunnel does not like the same settings. I told my support tech to disable the NAT-T on the MX84, as we have a no-NAT rule on the ASA. If this does not resolve the problem, I will move to decrease the lifetime of Phase 1 and 2. Then there is a firmware upgrade on the MX. Apparently, I am on a very old firmware - 13.36, i was advised to upgrade to 14.40 I believe...whatever is the latest stable version now. I'll keep you guys posted.
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