My music has trouble playing off external 4TB MYBOOK

I’ve been having problems playing my music stored on an external WD MyBook. I had trouble on my old HP. I replaced it in November with a new DELL pc, but I am still having issues. At first I thought it was the iTunes software & reinstalled it a number of times. As I said, I then replaced the desktop. ITunes was still not working on the new pc, so I tried Media Player then installed MusicBee. Same problem. What’s happening is the music will play fine for a random amount of time. Two minutes, 30 minutes, whatever…then the music would stop and start every 15 seconds. I am at wits end. HELP ME OBI WAN. I have a 90,000 song library I can’t listen to.