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Do you think it’s possible that I’ve just been incredibly unlucky and bought one of the few In said “bad batches” ?

Always been washed with a twin air box cover , had engine oil and filter every 3-4hours didn’t even make it too the 5th ride , I’ve heard good things about 22 and below but 23 and 24 seem to be having a lot of engine issues heard a lot of 23 going bang extremely early

Can’t quote on the 22 but I just recently bought a 23 yz250f managed to put only 15 hours on it from new before it dropped the inlet valves causing it too destroy the cylinder head and crack the cylinder , needs a whole new top end , not sure if this is a common thing or I’m just incredibly...