I started experiencing a weird issue yesterday and today. I've had my 6S Plus 128GB since launch day. I've experienced a tiny bit of lag here and there but nothing that has been bothering me. I did set the phone up as new on launch day. Well yesterday (a day after installing 9.1 OTA) I unlocked my phone and tried to pull control center up but it wouldn't come. I then tried to swipe to another page and I couldn't. Everything was normal, the screen was literally just frozen. I clicked the power button and turned the screen back on. Once again, used Touch ID, phone unlocked, screen was frozen in place. I let it sit for a few minutes, didn't lock the phone I let it auto-lock and after about 5 minutes I tried again, nothing, still frozen. Held the power button but couldn't swipe to turn off when that screen came on. I was about to do a hard reset when all of a sudden the phone advanced to my second page of apps and everything was working. It was fine for the rest of the night.
Now today, I got home from work early in the morning, went to pull up control center from the home screen to see my front door lock and same problem. Wouldn't come up, I was able to unlock the phone with Touch ID, but the screen was frozen. Phone is working, as volume works, Touch ID works. I just can't use the screen at all for a few minutes and then all of a sudden it just starts working.
Any ideas?