CoPilot Agent: Frequently Crashes under Think Deeper Mode

I have written a CoPilot agent that writes narratives (essentially reports). Through trial and error, I have discovered that "Think Deeper" mode produces optimal results. However, more often than not, the agent "crashes" at some point during execution of a particular task. The agent never crashes when I ask it to perform the exact same task under Auto mode. I would appreciate any suggested solutions.