Hi, after 5-10 minutes of Mining on the video card is starting to show booooo! Restart miner 5-10 minutes and then boooo!
A (very) limited number of Boo's is not a big issue. Especially with a fast coin like coino.
On my pool
http://coino.nation-wars.com it varies per user between 0% and 5% depending on the user
Another solution could be to lower intensity a bit.. lower hash-rate but when you get higher rate accepted, you are effectively mining faster!