Y40-80 Volume/Sound and Screen Flashing Problem

Hey guys, I'm having an issue with my new Y40-80. The volume will sometimes noticeably decrease and then randomly go back to normal. I have installed the relevant audio driver from Lenovo as well as completely updated my laptop through Windows Update. I have also done a complete system restore, but to no avail. I also get a hissing noise when using my earphones, which is normal, I got it on my last laptop as well, but the thing is, the hiss also comes and goes. If there are no souds playing, then the hiss is gone, but right before I click something that is going to play a sound, like a song, for example, the hiss comes back, but if I pause the song, the hiss remains for a few seconds before going away and being completely silent again. Perhaps I received a bad audio card? I also have an issue where my screen will sometimes quickly flash pure white or some distorted image of whats being displayed. I have only had this issue while playing this online game called League of Legends. I have also installed both the relavant AMD and Intel VGA drivers from Lenovo and my laptop is completely up to date. Any help is apprecitated. I really like the laptop, but these issues are annoying and are making me wonder if I have received a defective unit. Thanks!

Well, I seem to have found a solution myself. Posting it here in case someone comes across the same issue. Instead of downloading the Realtek audio driver from Lenovo's website, I downloaded the appopriate one from Realtek's website. Here: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=24&PFid=24&Level=4&Conn=3&DownTypeID=3&GetDown=false I believe the audio driver that comes preinstalled is the same as the one on Lenovo's website and I don't think it's for a Windows 8.1 but is instead an old driver for 64 bit Vista.  Also, for the screen flashing problem that I was encountering while playing League of Legends, I believe I've also found a solution. Instead of downloading the AMD driver from Lenovo's website, I also recommend going straight to AMD's website and downloading the appropriate driver there. I tried using their auto-detect utility but the issue persisted. I went to AMD's website again and this time manually searched for a driver and came across a beta driver and so far so good.  

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