Liebherr CUNesf 3533 – Error

Hi, I have the following problem with my refrigerator Liebherr 3533:

for the last couple of days, I see an error showing up randomly (sometimes it is every few minutes, sometimes hours) on the panel the 9 + 5 + SuperFrost LEDs are blinking green and there is a beeping sound as well. When I turn it off and on again it stops (the error) for sometime. Could you please explain to me the error message the fridge is treating me with and is there a way to fix it? 🙂 I need to mention that besides that error everything seems to be working fine and the temperature both in the refrigerator and freezer is normal.

Thank you!
Marcin