Unexpected appeared "unknown error" in Inference API

Hello! I uploaded my first model to the Huggingface HUB Mraleksa/fine-tune-distilbert-exitru · Hugging Face, and was immediately able to use the Inference API. But a few hours later, an “unknown error” was received, despite the API status being displayed as “This model is now loaded and running on the Inference API.” Can someone tell me how it happened?