iPhone 6 Plus hang freeze issues

My iPhone 6 Plus keeps hanging (freeze) for past 6 months, I have to reset the whole phone sometimes up to 2 times just to get it to work again. Been a loyal custome (incl my whole family) since gen 1 iPhone, iPads , mac book. Am truly disappointed with the quality now. Didn't bring to service center since day one of the problem because I thought was just some bugs & was sure apple will fix it, but after numerous upgrade of iOS till now, the problem still pesisit.

iPhone is no longer the quality I once knew, hope apple can rectify this issue before losing more loyal customers eventually