Usb hdd's disconnecting during play

I never experienced disconnects during playback the last years (WDTV and now WDTV Live) but since the last firmware update some weeks ago my WD harddisk disconnected 4 times. Its the same powersource direct from the wall outlet.

This happend with two differnt devices: first: 2,5’’ 500 GB and 1,5TB connected with USB 2.0.

Can you please check this issue at Western Digital.

Thanks…