anyone else noticed that the SSD speed would drop significantly after some days' usage. when i wiped the hard drive and did a fresh install, the write speed is like 400 to 500, but after like a week or so, it would drop to like 100 sometimes even below that. read speed is fast as usual bought two MacBooks, and did like 4 installations, all have the same problem. anyone brother to test their speed again for me? many thanks.