Model Unavailable

Normal execution happening mostly in mid night

Model Unavailable
The model you've selected is experiencing high load. Please switch to another model and try again.

The report identifies only the “Model Unavailable” message and says it occurs during normal execution, mostly at night; no file, test, or entry point is named. Start by reproducing the message and tracing the model-selection or availability path, then document the exact conditions and verify that normal model execution no longer produces this failure.

Written by the indexing model from the issue text.