Audio Skipping while Playing Music
I had an ongoing and frustrating experience with audio skipping and the "sdcard unexpectedly removed" fault.  I disabled programs, kept my screen open, got a faster card etc.  I should say here that my audio was not on the sdcard, it is in the phone memory.  I hunted through my settings time and again, and finally I came across something in the developer options.  The option to force apps to ask for access to the sdcard was checked.  I unchecked that option and presto!, both my problems went away.  Also, I should say that no app ever asked for permission to access the sdcard.