Running almost any notebook with a merge statement in Databricks with DBR 14.3 I get the following error and the notebook exists:

"Fatal error: The Python kernel is unresponsive."

I would provide more code, but like I said, it is pretty much anything with a merge statement, except for the tiniest of batches. Anything larger than that fails. Changing the compute to DBR 13.3 resolves the issue. Has anyone else encountered anything similar?