Hi,
Please refer to MAX 10 datasheet: https://www.intel.com/content/www/us/en/docs/programmable/683794/current/internal-configuration-time.html
The required configuration time is in tens of ms as compared to hundreds of ms as you mentioned in your description. This means, that the device might have already been in user mode by the time you turn off again.
Also, to note that MAX 10 devices support hot-socketing. Refer, https://www.intel.com/content/www/us/en/docs/programmable/683400/18-0/hot-socketing.html
Request you to please reply in English for this ticket. I had to use translator to understand your query.
Regards