Have been using 1 3018 with 20 watt laser for 3 months now. All of a sudden it won't even do norton white tile! Cleaned laser that spot is small and bright. Any ideas?

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Have been using 1 3018 with 20 watt laser for 3 months now. All of a sudden it won’t even do norton white tile! Cleaned laser that spot is small and bright.

Any ideas?