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Anything that'll make it obvious before it gets to that point?
Did 2k miles on the old kinesis, never bothered getting that faced but never had this issue. Transferred everything over to the warranty replacement frame (no facing again) and had this slight grind sensation ever since. Can't see what else it could be, but fit doval chainrings at the same time so dunno if that could have something to do with it...
Needing to change the BB fairly often is a good one.