Yasuo can't autoattack after ult sometimes

I wrote that stuff already on twitter on the riot-support site and they told me to write it again on this site so here I go: Hi (。◕‿‿◕。). When I use Yasuo's ult I can't autoattack for one or two seconds really often. A lot of people seem to have it and I found a video of it. This dude in the video ulted riven. She stunned him and jumped away. After that fight he tries to autoattack the minions but he simply can't for a short period of time. I have it every game. It pains me a lot in intense situations like a good yasuo ult in a teamfight to not being able to do autoattacks. Here is the video of that dude: http://www.dailymotion.com/video/x2p08vo Thank you.
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