I am trying to copy multiple files to my phone from my computer using ES Explorer. I can get the first 4 files copied then the file transfer hangs at a random point. It is not the file, as it happens with multiple folders. Is there an upper limit the number of files able to be queued? I am only trying to transfer a folder with ~20 mp3's, but they are large in size because it's an audiobook. I think the problem is that the phone is killing ES to free up ram, because if I go to the home screen then back to ES it takes me the tld and not the most recent folder I was in.