Q: When iPhone 6 connected to iTunes on Windows 10 it becomes unresponsive and freezes?

Hello SqEaKyP,

Thanks for using the Apple Support Communities!

I understand that iTunes is becoming unresponsive when you connect your iPhone 6. We know how frustrating situations like this can be, but we are here to help!

To begin troubleshooting, I suggest reading over and working through the suggested steps in the following article. 

iTunes: May become unresponsive when connecting iPhone, iPad, or iPod touch - Apple Support

Cheers!