Anyone else 17month olds fighting morning naps?

So for like the past 10 months are so my son has been like clock work. If he wakes up by 7, he will stay up eat breakfast and play for a bit then he gets sleepy and that’s always like 2 hours after he gets up. So his first nap is around 9ish. He will sleep anywhere from 30 min to an hour. So if he wakes up at 10 am his next nap falls exactly 3 hours later so it would be at 1:00. He will normally sleep an hour so he would wake at 2 pm and then his bedtime is usually exactly 5 hours from the time he wakes up from his nap which would be at 7:00 pm. Well everything had been going great but about the last month his 2 hours from the time he wakes to his first nap I have having to stretch it ( anywhere from 2 hours 30 min to 2 hours 45min) before he lays down his first nap. And this week has been even worse. I have been letting him stay for 3 hours in between but he is still fighting like crazy not to go to sleep for his nap. Just wondering if anyone else is experiencing this phenomenon???

Thanks so much.