MyBook Essential USB2.0 2TB stops spinning every now and then

I backupped a lot of video files and noticed than sometimes the copy process paused for let’s say 30 seconds and then resumed with no errors. Today, while watching a movie with the WDTV Live, the movie freezed for some 20-30 seconds, then fast forwarded and resumed normally. The drive mounts the 2.018 firmware (I can’t update, same problem as here Any ideas?

Hello, test the MB using DLG.

Already did that: no surface errors.