Just what the title says. Lately every time I mix down the machine freezes. Can't go to mastering, go back, power down, can't do anything, I have to unplug. Then after I power back up I go to mastering and after that, it also freezes. Can't Normalize, nothing. Again I have to unplug, then I can go to mixing/mastering and finalize. It's very frustrating. My last DP-24SD did the same thing, but that was after 5 years, this is under a year. Any help before I send it back?