My iPhone 6+ used to work great. Now it’s laggy and crashes a lot. Often, it even has a hard time scrolling in safari. I hooked it up to the computer and did a complete reset/restore, and it didn’t help. I chatted with Apple. They told me it’s hardware related and to buy a new phone without giving any explanation of what is going on. Geekbench says my battery is just fine. Is the phone just self destructing?