You'd have to try to manually reproduce that to test it. But the lesser practical solution would be to get a static IP or better battery backup. I'd be surprised if the MX doesn't keep trying to check it's port for a DHCP connection. Also verify you are on the latest firmware.
Adam R MS | CISSP, CISM, VCP, MCITP, CCNP, ITILv3, CMNO
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