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I got 3 defective R-72 units. I had a different issue than you are having, but after the 3rd I chose to not try another one. My T80 an T112 have been solid.

Best of luck.

T112, T80, iDR48 (2), iDR16 all w/M-DANTE, PL10, MixPads, Editor
MacBook Pro, Mac Mini,PC
Lion/Logic Pro/PT10/Reaper
All latest versions/firmware