i have mined over 1000 times before seing any fatigue, i think it may be due to my gear set and that i mine for +1's (full perception > VIT) some of the time on G5 nodes it takes 2 hits to get success so this may be taking longer and the regen of mining may be allowing me to mine for longer before seeing any breaks.

has the same tests be performed with Perception set, Gathering set, Output set etc?