Newly bought RBK50 constantly lose internet, after setting up "Block services", "Schedule"

Hi all,

I have bought a RBK50 set few days ago.

I have set time limit access on one of the device in the network (My kid's), by the following steps:

1. Under the advance setting, I assigned a specific IP for the device. (192.168.1.8  for the device MAC address xx:xx:xx:xx:xx:xx), under "LAN Setup"

2. Under "Security", "Block Services", I added this IP address 192.168.1.8, block service type: "Any"

3. Under "Schedule", I set every day, from 22:00 to 21:00

I would expect every day between 22:00 to 21:00, the internet for this specific device would be blocked, and this device could access to internet between 21:00 to 22:00. However, every day all the devices within the network all lost internet connection at 22:00. The internet connection of other devices only resume, after i pressed "Apply" in the page "Block Services" and "Schedule"

Is there any solution? Does anyone have any similar experience?

Many thanks.