FINALLY! I am not the only one with this issue. Everyone tried to blame it on my media quality as well which is also TYG02/MXLRG03, or the way it was hooked up etc, but I knew damn right it had nothing to do with me or my media.
Check here, start at post #188.
I am having the exact issue where the drive was working then suddenly quality media would not burn at their rated speed. My drive refuses 90% of the time to burn faster than 6x. The drive drops down from 6x only to build back up to 6x when it should go to 8x+. If you continue to read through the thread after post 188 you will see the different things I tried as well as the things people have suggested/blamed on me about the issue just to find out nothing in the end will remedy this. Have a gander and let me know what you think. I truly think something is up with at least some or a certain batch of the 111 that very few notice on their drive. I guess we are a very unfortunate two to have noticed this problem. If you can, please tell me month and country of manufacturer so we can see if there are any simularities? Thanks and sorry about your drive, I know EXACTLY what you are going through with it.