Every time I try to copy a file using Android File Transfer, it sticks around 16kb, then says it can't copy the file. Then it give the 'Can't access device storage' message and Android File Transfer automatically closes.

I used to copy files all the time this way. I've reset my computer and the phone. I tried a different cable. I deleted some files from the phone. Any idea what the problem is?

 

Yeah, I have plenty of space on the phone (I was able to delete a few gigs worth of videos).

The phone stays connected just fine until I try to copy a file. It consistently disconnects right after it tries, unsuccessfully, to copy the file.