I had the same trouble but don't have any issue any more. I learned that when tightening it, you don't have to crank it down. Just turn it until it barely snugs and that is it. There are enough threads on the plug that you don't have to worry about it. Just barely tight and then it will come out every time. I don't think tape is necessary if you do as I say above. I was shooting my disc extreme a lot before last season and never had a problem after I learned to barely snug it down. Good luck.