qs.pid file on LG G2?

Hi, I have a question for you experienced guys in here. My phone has been acting a little wired recently, I had some notifications saying "Restricted Access changed, dataconnection blocked." some weeks ago, the notifications stopped about a week after. I thought it was was wired, and ran some Antivirus (Lookout, boost, malwarebytes), but there was nothing to see, then today I went in to "My files" and in "Internal storage" there was all down in the bottom, a file called qs.pid, it was white, not yellow as the rest of the files, and you couldn't open it..... Anyone know what it is? Thanks.
Phone: LG G2 (D802)
Running 4.4 kitkat
My country: Denmark