Computer enters sleep mode shortly after leaving sleep mode. Defect?

I have a problem. It's not a serious problem, but since it seems to be hardware related it might cause problem in the future.
It's pretty simple. Let's say I fold the computer screen down and leave the computer in sleep mode. If I then fold it up again it will automatically enter sleep mode once again 25-30 seconds after waking up. It doesn't matter what I do. I can be completely passive or open any app and move the cursor as much as I like. After roughly 30 seconds the screen turns black and I have to press a key to wake it up.
It never enters sleep mode any other time if I don't choose so, it's always after being in sleep mode already. And it happens 80-90% of the time, but I have not noticed a pattern for when it doesn't.
Naturally my settings are in order. I just updated it today and no difference after one attempt with the new OS version.
Any ideas?

Sleep.
Shutting down a Mac is never required. It is best to let it sleep, unless you are planning to not use it for a period of time considerably longer than a few days.

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