My iPhone 6 Plus refuses my passcode

[OBEN VITI]

My iPhone 6 Plus refuses my passcode
Why does my iPhone 6 Plus keeps on refusing my passcode after I have input the correct passcode and suddenly blocks and it’s presently asking me to connect to iTunes

 

[SwitchBeach]

Are you talking about the device passcode or your iCloud/Apple ID password?
Have you tried resetting the passcode/password?

 

[Lee_Bo]

“If you can’t remember your passcode, you'll need to erase your device, which deletes all of your data and settings, including the passcode.”

https://support.apple.com/en-us/HT204306

 

[Wotchered]

My XS recently did this or something remarkably like it. I had to go to iTunes and sign in again, which I don’t remember doing before. It’s all right now.