Hi Mikkel!
I don't have a direct fix for you , but I can tell you that i have a DR16 which i fire up once in a while when I run out of PT tracks..
Sometimes when i go to load a song , it will freeze...if u accidentally double click enter ,or anything else on the keyboard at that moment. The only solution is to switch off and on again.
Another weird thing I get is with the EBU card...I can be running a mix all day ,and everything is cool, but then the DR16 will suddenly lose sync..it won't recognise incoming timecode at all..... and the ONLY cure for that one is to take off the lid and reseat the EBU card...and off we go again. I get that a lot , especially in summer , when the room really heats up ...sure enough , next morning ,after the nightime temperature drop , i will have to reseat the card again!
Sorry to go on about all this, but it leads me to think that you should try simply 'reseating ' the drives connectors and check the scsi id swiches etc, before going in deeper....maybe you already did...I know it's elementary stuff , but I think the DR16 is more prone to that sort of thing than anything else I've ever had.
Cheers
nEon.