My experience is obviously limited, but I can but report my personal experiences. On the face of it, it's hard to see why an undisturbed JB with screwed terminals should suddenly develop a problem after years or decades of satisfactory service - although I don't sure that I could necessarily confidently say the same of ('spring-dependent') 'MF' JBs.Oh how I wish I could make the same claim. ... Noise of arcing in lighting JB's drove one family to distraction, they thought they had wasps in the loft but couldn't find them.
Of course, one of the issues with accessible screwed connections, particularly in situations such as CUs, is that they often are repeatedly 'disturbed' (most commonly in the name of 'testing'), in which case all the above bets are off
Kind Regards, John