Response to xtol 1+3

Is the dreaded Xtol failure still happening? It hasn't happened to me, but I decided to use 1+1 instead of 1+3 following some advice somewhere that it would reduce the risk. It appears to occur at random to people who have not had previous trouble, which would probably eliminate water quality issues. Has it happened to anyone out there recently? Any correlations with anything identifiable?

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