They couldn't scare enough investors into selling low, so they run it up by covering, hoping to get them to sell at the high...then walk it back down for more short covering.
Yeah, the news that we're all awaiting should put a (temporary) stop to all this nonsense...which will then be at a much higher SP.
I suspect it's also day traders who are buying low in the morning and expect it to rise knowing that we're very close to getting the next update, and then selling off in the afternoon after it's reached the high for the day.