Hello all, I bought an iPad Air (1) last autumn, the base model, 16GB WI-FI. Brand new. My grandparents have the exact same one. When I got mine, I was surprised by the amount of UI lag, compared to my grandparents model. Back then they were both running iOS 8. I tried resetting it and setting it up as a new iPad. For a moment I thought it had helped. Now, both running iOS 9 it's still evident how mine runs very poorly. For example, my iPad Air completely bogs down while having only a few apps open. Everything becomes sluggish. Now, using my grandparents iPad, it usually has pages, and pages of open apps (they don't know how to close them) as well as many, many tabs open in Safari. Still, it never bogs down at all. No UI lag. I'm beginning to think there is something wrong with my iPad. It doesn't run that much better than the old 1st gen Mini I used to have, whereas the other runs similar to my iPhone 6 and my GFs Air 2. Any advice? It's still under warranty but I doubt they'd replace it after so many months. Thanks in advance!