Apple Watch SE 2gen turning off randomly

Hi,

I have a problem with my Apple watch SE 2gen turning off randomly even if the battery still has some power, for example, 30/40%. Furthermore, I can’t turn it on until I connect it to the charger. After that it magically restarts and I can unplug it. Such a situation happens every 2/3 days.

Anyone have any idea what can be wrong?