You must change your iPhone password in 60 minutes!

Apple completely bricked my phone.

I received this message two times in the last 4 months: "You must change your iPhone unlock password within 60 minutes"

This has happened to me two times with the same phone.

iPhone 6plus/ 9.3.1 (most recent update)

The first time however, as I attempted to change my password, it would not accept it. It said it was incorrect. How?!! After continuing to input the ONLY password I've ever had, I was locked out of my phone.

I researched thoroughly on what to do.

I actually had to manually erase my phone through iCloud.com It literally locked me out of my phone until I erased it. Completely inconvenient.

Then after I restored my phone, I created a new password. This fixed everything for awhile. It was a pain, but I thought maybe it was just a glitch.

It was good for a couple of months until I got the message again: "must change your password in 60 minutes."

So I did. But this time it asked me to go from a 6 digit to a four digit. What?! Why would it prompt me to go from a 6 to a 4 digit code? I did, because God forbid I got locked out again. A few minutes later I went back in manually and changed it back to a 6 digit. So far so good, but on pins and needles.

I have no clue why this happens. It's very frustrating since I travel for work and I am basically useless without a functioning phone.

There is nothing "different about my phone"

It's...

-only for personal use; not work provided. I purchased it from Apple; only user.

-no exchange accounts, no MDM

-latest software update installed

-not jailbroken

I have no idea why this happens!!!