I am printing on doubleweight matt sheets (Hahnemuhle photo rag bright white) and the paper sometimes gets caught in the printer. Not a paper jam, per se, the print completes and is ejected, but the lower right corner of the paper (as it exits the printer) is folded and wrinkled. I have set the platen gap to "wider." It almost looks like the leading edge of the paper is hitting something and is then forced past the obstruction, causing the folding. Any ideas?