@Kevin_Z 

Yes received the email, have already updated to the debug firmware & setup the usb for logging +gave the additional details.

Some update from my past experience.

I hate to say: it's getting worse and worse over time. I started to back up the config very frequently. I have a weekly reboot schedule so that the route won't go crazy but it makes the router even crazier. On reboots, it lost power (or at least it seems so). The device just won't go back live (the LEDs are off). Sometimes, I had to unplug everything (power button doesn't work) and even waited for 10min to retry. Resets after it actually boots up. I finally got tired of doing this and started RMA.

I received a replacement unit under hardware 1.20. However, it won't recover from any backup files I generated from my previous one. The error message is meaningless so I wonder why bother providing such a broken feature? It's just so useless feature.