I have a TS-569 Pro and I've upgraded to 4.2.0 in the last days. The system became not responsive a while after the upgrade has completed and the system has rebooted. No way to reboot it via the LCD. So I hard to power off the hard way. The file system check on the RAID-1 built on my two 2 TB WD20EARS completed in a couple of seconds. The file system check on the RAID-5 built on my three 3 TB WD30EFRX is still running after more than 48 hours. I've opened a support request, but still no reply after two days. Even tried with the online chat, but no way to get in touch with an operator.