Hi WingDog,
It it's not recommended to run Junos releases newer than 12.3 on the EX2200-platform due to memory limitations.
This is also stated when looking at JTAC recommended releases for the EX2200/EX2200-C: https://kb.juniper.net/InfoCenter/index?page=content&id=KB21476&actp=METADATA
I will suggest to downgrade to 12.3 before doing any further debugging on the issue.