Hi Gabe,
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my first suggestion would be to remove the motor from the mount and test it with no load. If it’s still stalling then there definitely is something wrong. Could be the motor or, more likely, a faulty software update. If it doesn’t stall when unloaded then it could be a balance issue. I do recall L6 being more finicky with balance than L5 was, but I think that was resolved? Sorry, not entirely sure about that last statement :)
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good luck
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jonathan