honestly Deriak, I would consider the possibility of mental fatigue. Might try 20mins of meditation between sessisions and/or invest some sugar/caffein after about 4hr or so if brain farts are the issue. Eating too much can dull your mind / attention too, so if your third session was after lunch, maybe next time have a light lunch like some fruits and then have your normal lunch after the last presentation.
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<Millenial Snowfkake Utopia>
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