Key legal question
Whether the early termination under Art. 257f para. 3 CO was valid despite the time elapsed after the last warning.
Extracted holding
The cantonal court assessed the delay too narrowly; the landlords acted promptly once they learned that the nuisance had not ceased, so the insupportability criterion could not be excluded solely from the elapsed time.
Extracted reasoning
All relevant circumstances had to be weighed, including the intervening lull after the meeting with authorities and the late relay of new complaints. Focusing only on the ten-and-a-half-month interval was an abuse of discretion.