my iphone 6s has been freezing(?) a lot lately. it was perfectly fine until i got my screen replaced since it was cracked, i think thats what the issue is since it started freezing a few days afterwards. i cant use the phone, i can open it but after that i cant swipe or select any apps for long but it will unfreeze for a moment so i can just select an app but it will freeze again after it opens. ive done everything to try and fix it, including resetting it but nothing has helped. what do you suggest i do?