Please consider this information completely unofficial and as-is, but if it were me I would also try re-seating the mirror inside the head. The procedure is described in a few messages from support on the forums, e.g. step 3 of PG Cherry Not Cutting or Engraving Properly. If it were me I would do that very very carefully as it’s a delicate first surface mirror (the silver is on the outside). But on the off chance that it has some how popped out of alignment, it could be causing focus issues. You don’t need to do much besides pop the cover off, pull the green thing out, and carefully put it back in place. Maybe take a quick peek and see if it’s dirty, but I would avoid trying to clean it unless obviously necessary.
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