I try.
We don't have any Latex printers, so I'm not sure what it might be, but it seems you might be having a reaction of some sort, if this is the first time with this media, perhaps due to humidity, dryness, temperatures or something in the air, if all other actions are the same for 8 years. Otherwise, if you haven't changed any part of your routine, I'd say..... it's Friday afternoon, f*ck it and go home.