Liebherr SBSbs 8673 refrigerator stops cooling

[Kana]

Hello :)

 We have a Liebherr SBSbs 8673 fridge for 4 months ( we bought it used tho, freezer was unused, but seller told us that refrigerator was used for 1 year before us).

And every month it stops freezing. First time fixing company changed compressor it worked fine for ~one month, next time they cleaned tubes and now, a month passed and it stopped cooling again.... Any ideas would be much appreciated, because loosing a fridge regularly is frustrating T_T

 

[WOOKIE]

check the diagnostics for error codes.  then, that will give you a starting point. 

[Kana]

No error codes