Kyohei Yamada Greetings & Welcome to Microsoft Q&A forum!
I tested it on Friday night, and when I next opened it on Monday morning, both of the models I had made were gone, and the settings inside had been reset.
I would recommend checking your account activity logs to see if there is any information about what happened to the models.
I would appreciate it if you could let me know the deadline and usage restrictions in this case.
Training configurations are typically available for six months after its release. If you've assigned a trained configuration to a deployment, this deployment expires after twelve months from the training config expiration. If your models are about to expire, you can retrain and redeploy your models with the latest training configuration version.
Please see Model lifecycle for more details.
Let me know if there are any further queries.