The wife and I noticed a similar change in our elder son he's 3 so still quite young but we seem to have narrowed it down to two issues exhaustion and hunger. He simply doesn't know when he's hungry or exhausted. We constantly ask him if wants to eat anything which is met with a swift no however this adds up to the point where he has a meltdown because he's hungry and just doesn't know it or want to admit it. Force him to eat something and he's a different person. Same thing when he's exhausted or hasn't had enough sleep.
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