FN - Key NOT Working ?!

Hey Guys,

I’ve got the 13 Framework Laptop with an 13th Gen chip.
From time to time my Laptop is locking my fn keys, it was “fun” but I always could use the fn keys after I pressed fn+esc/fn lock. Until a couple days ago, fn + space isn’t even working to enable the keyboard light. So my question is:

How do I check wether the fn key is broken ?

Or is the fn + space test enough to sort out it’s the fn-key which isn’t working ?

kind regards Jonas