Turned off (completely). Never.
Rebooted/hard reset. 4 times since I had it. It's usually due to a crashed app. Esp in the older firmware in the very beginning. I can't remember ever having to reboot/hard reset since like iOS 4.2.
("slowness" will disappear when the OS kills off apps in the background and frees memory. Or you can manually do that if you don't want a few seconds of sluggishness during these freeing. Just close the apps in the background yourself)
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