When i scroll up to current tabs, sometimes it freeze and not allow to swipe between recent apps. The worst it may become small screen and hang at middle screen, just sometimes, i can solve it by press home and swipe up again.
Second issue is, facebook or other apps, after i click to open photos or review, phone is freeze, not showing anything, pressing back key only back to main page and happen same if i click into photo or review again. To solve the problem i have to clear the app cache and datas. It happen often recently.