Okay, I have, well, I had, the Clean Master app on my Edge, and it was prompting me to move my apps the my sd card. I was waiting, because I bought a new 200 gig card, and it hadn't yet been delivered. The card arrives, I put my media on it (including nearly a 100 gigs of MP4's), added even more MP4's and installed it. So, my Clean Master makes a list for me of the apps that can be transferred to the SD, and the process is long and tedious. One at a time, I have to touch on storage, then change, then SD card, then wait. And over and over. So the process is finally, at long last, through, and I look at my app drawer to find empty pages. My SD card apps have disappeared. I do a search. They're not there. Then my phone freezes. I cannot do a thing. I manage to do a restart, and it freezes while doing that. I have to hold down the power button and volume down, and I get it back, but it is performing terribly. I decided to do a factory reset, even reformatting my SD card, and it freezes in mid reformat. My SD card is "corrupted," it says. So, I opened the card tray and removed it. The device started performing better, but I went ahead and did the factory reset. And I put the card in my pc, reformatted it and reloaded the media, which of course, took hours, since I was filling 143 of the 183 available gigs. Oy veh. Anyway, I did not reinstall Clean Master, and I am not doing any more app transfers. I don't know what or if I did anything wrong in the process, but it was scary. I was terrified that I had really screwed things up irreparably, but I didn't. {{Huge Sigh of Relief}}}