A bit of post mortem here:
The dcpfe process crashed after trying to show the interface stats of a GRE interface. We were umable to find an exact matching PR from Juniper. Juniper has multiple PRs that involve a dcpfe crash.
We believe that it's a special condition with the PFE, maybe some kind of memory leak. We have configured over 100 GRE tunnels on this device so far and we never had this issue.
After all these issues, we've decided to replace ear.fr7 with a different device from a different vendor. The vendor has proven itself to be far more stable and more reliable.