Nintendo switch just goes off for no reason. What could that be?

I was playing Monster Hunter very comfortably and suddenly the picture was gone. At first I thought my TV went off, but when I saw that my Joycons were off I knew it couldn't be because of that. Then I went to my switch and saw that the console was off. Then I turned it on again but only got the error message that I was kicked out of the game because the console went into standby mode. But I played and was in the middle of it, so it can be hard because of that. What could that be? I only found something online when the switch does not work but nothing that it simply goes out.

What could that have been and should I be worried? The console is quite new.

If you still have receipts then exchange them for

Try the support from Nintendo.

Possibly a loose contact on the battery