Talk to me about naps with your 15 month olds

Hi all! It's been awhile!

So my son is a great sleeper with bedtime. Goes into his crib after a bath, a book, and pjs. He sleeps 8pm-7am every night.

Recently naps have been a MESS! He has been snapping twice a day once around 10am-ish and another around 2/3pm-ish

He almost seems as if he can't settle. Yesterday he was so tired he fought it for so long. He had a meltdown where he kicked screamed and cried for an hour till he basically passed out. He never took his second nap and went to bed 30 mins earlier.

Here we are today, on the brink of another meltdown.

Please help!