I have started using the stock twitter app and have it set to check every 5 min, notification sound & vibrate for new tweets. But for some reason it does not do this on a regular basis. Sometimes i will get them as i want but more often i will have to manually refresh just to see the new tweets. Any idea what could be causing this to happen? I have tried another free app from the market with similar results. So i am guessing this is either a phone or network issue even and error on my part. Any help would be great.