I have about 2gb of empty space on my phone. Recently it'll say that I'm running out of space and I check storage it says I have 30mb of empty space. There is a miscellaneous folder that is taking up that space and the biggest file inside is called "dianxin" which is almost 2gb in size. So I use du speed Booster but that helps temporarily. What can I do to fix this and what is this file "dianxin"?