^^I bet Pig flu all started cause someone kissed a pig
I'd say bad grip - especially with your weak hand. A while ago my right hand used to be shocking - I'd get sore fingers if I was playing for a while and I tried to fix it but couldn't. I had to concentrate on it pretty much every time I played so now it's not as bad, although my right hand still has a few issues when it comes to precision and high speeds.