My new job issued me an iPhone. My first iPhone. I just did the update to 8.2 and now it is nearly impossible to use. Doesn't respond to touch almost all the time. Some times it will register a touch, sometimes it is laggy, if it responds at all. I did a Reset > Erase all content and settings. That seemed to fix it until about 10 minutes later it came back. Can't find anything on the internet to help. Anyone have advice? Thanks!