Macbook battery life and sound problems
My Macbook air's battery life is going down very quickly even when I'm not using it and when I'm not downloading anything. A few months ago my battery can last up to 2-3 days. Now, it can't even last 1 day. Not only that, sometimes when i am on YouTube, no sound can be heard even when the volume is on. I also noticed that whenever i surf the web, it cannot even load the page or either it also takes a very very long time for the page to load. There is no virus on my computer as i will scan my macbook once a week using AVG anti-virus program. This, however, has never happened to me for the past 8 months when I'm using my Macbook Air. What can i do ? Im currently living in Australia. Thank You.
MacBook Air, OS X Yosemite (10.10.2)