I've noticed some serious lag with the Spotify app on my 5S in the last few days. Especially when waking the device or switching between apps. If I'm playing a song and my device goes to sleep, when I wake it, it takes several seconds to do anything in the app - pause, scroll, get to menu items. I've only noticed this recently. Prior to that it was always buttery smooth for me. I'm not having any other lag issues with my device. Anyone else having this issue? I haven't deleted and reinstalled the app yet because I have a lot of offline music I don't feel like re-downloading.