Question about Seccheck showing kernel tainted (and then not)

Question about SecCheck:
Two days ago I did get a curious outcome, saying:


- kernel.tainted = 0
+ kernel.tainted = 52

And they day after:


- kernel.tainted = 512
+ kernel.tainted = 0


So the question I have  is: how can a kernel be marked "tainted" and the day after "untainted"? 
I since I did not AFAIK install something that taints, is that provoked by a patch? Or do I maybe have a hardware problem (memory?) 

Thank you




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