Have an iPhone 6 plus. Ran all the betas. Around the last three betas, my keyboard became extremely laggy and continues to be even after the final OS release. I can type a sentence and about three seconds later the words will show up after a flurry of keys popping up. I've reset all settings, as was recommended elsewhere online. Problem hasn't gone away. Anyone else experiencing this issue, heard of it or know how to fix it?