I have had this issue for a long time, unable to solve it. I have tried many things.
First of all, here's the problem:
People have reported that they can't load my website. All they get is a bunch of random characters: http://i.stack.imgur.com/sBWPt.png
I can't reproduce this problem on my end no matter what device I'm using, so it's almost impossible for me to fix it. Whenever I try something I can't even check if it had any effect or not.
I've been using http://www.gidnetwork.com/tools/gzip-test.php to test, but I don't get any error messages.
Yet my readers keep complaining about not being able to load my site!
I'm losing more and more traffic because of this.
Often after refreshing or waiting a few minutes, most people seem to be able to load the site properly, though.
The only time I ever notice that something is wrong is when I try to share one of my posts on Google+. The post's description then shows up in weird characters.
I contacted my webhost (LiteSpeed server) and they said they can't reproduce the issue on their side either. They suggested turning off one plugin after another, but as I can't see the problem myself, I won't know if things are fixed or not.
I also tried to look for any php_flush() snippet in my theme, but couldn't find any. That was suggested on the FAQ page of the W3 plugin.
I really hope somebody can help me.
Otherwise I think I need to disable gzip compression completely.
Here's my blog for reference: http://zoomingjapan.com/
Thanks a lot in advance!