Hello! I've been noticing the following issue: When I try to copy some files to my USB3 drive, all is well...until it starts slowing down and stays that way. At first, copying all files is very fast After a while, try to copy another 5GB file-takes 100 times more time. It basically seems almost stuck. It doesn't get better, unless I try the next day. Normal copy, then starts getting slower. It seems like some buffer has been filled and makes using USB drives impossible. Anyone knows what may be causing this? And how to solve? Mac Mini, Mavericks, 8GB. It happens in 2 (different brand and size) external USB drives I have. They both have many files, but are around 40% empty. Thanks in advance!!!!