I searched for multiple keywords before I posted this and if this is a repost please provide the link.
Ok so this is Warlock only obviusly.
What you need
1. Glyph of Drain Soul - Thottbot: World of Warcraft
2. Any other minor glyph...I used Glyph of Kilrogg - Thottbot: World of Warcraft
Ok so I was using the drain soul glyph and I decided to change to the kilrogg one. I went to the thing in SW and I changed it out. When I was farming soulshards later I got 2 shards from one mob. im like wtf? bug? so i said whatever and I continued farming...well a few mobs later it did it again. (this was 1-2 weeks ago) I was trying to figure out why it would do this but I didnt know...So a few days goes by and when im omost out of soulshards I start farming and it does it again. I remembered the drain soul glyph. Even though I dont have it anymore it still procs.
I dont know if this will work with all glyphs because im not wasting gold to figure it out but it works on this one...And i dont know if you have to use the Kilrogg one after it...Just experment it and post back.
Have fun before this is patched