Fenix 6x freezes after 100% recharge

No. It’s not normal. Sounds like a serious hardware fault. 

thanks for the answer ... I hope an assistant garmin will answer me

Are you saying the green screen that says the charge percentage stays on the screen?

yes, the percentage remains 100% on the screen .... I have to turn my Fenix off and on again to unlock it

Charging via connecting to a computer or a power supply? If via a computer, what happens if yo use a USB charger?

Try changine Settings - System -USB MODE from Garmin to MTP or vice versa

Ricarica il mio Fenix ​​tramite pc...non ho mai provato con il caricabatterie, proverò a cambiare le impostazioni di sistema e proverò,grazie

Normally what happens after disconnect is it checks if there's any files to process. So may be worth seeing if there's any files in the folder /Garmin/NewFiles on the watch.

That folder is checked when you disconnect for any new things like pace pro etc. If there's a dodgy file in there, it may be hanging when you disconnect if it cant read it.

If there's anything in there, copy it to your computer for safe keeping (in case you need it) - empty the folder and try a disconnect?

thanks, i will try as soon as possible