AC68U Hangs After Vlan Assigment in robocfg

[Digistras]

Hi everyone,

I own a RT-AC68U and running with Merlin's 380.58 firmware and following is my robocfg output:

admin@RT-AC68U-C218:/tmp/home/root# robocfg show
Switch: enabled
Port 0:  100FD enabled stp: none vlan: 2 jumbo: off mac: 00:26:75:d3:96:e1
Port 1:   DOWN enabled stp: none vlan: 1 jumbo: off mac: 00:00:00:00:00:00
Port 2:   DOWN enabled stp: none vlan: 1 jumbo: off mac: 00:00:00:00:00:00
Port 3:  100FD enabled stp: none vlan: 1 jumbo: off mac: 00:04:4b:80:80:03
Port 4:   DOWN enabled stp: none vlan: 32788 jumbo: off mac: 00:00:00:00:00:00
Port 8:   DOWN enabled stp: none vlan: 2 jumbo: off mac: 00:00:00:00:00:00
VLANs: BCM5301x enabled mac_check mac_hash
   1: vlan1: 1 2 3 5t
   2: vlan2: 0 5
  10: vlan10: 0t 5t
  20: vlan20: 0t 4
  56: vlan56: 2 4 7t 8u
  57: vlan57: 2t 4 7 8u
  58: vlan58: 1t 3t 8u
  59: vlan59: 0t 1 3t
  60: vlan60: 4 5t 7t 8t
  61: vlan61: 1 4 7 8u
  62: vlan62: 4t 5 7t 8t
admin@RT-AC68U-C218:/tmp/home/root#

So I wanted to add port 4 to vlan 2 hence I did the following command: robocfg vlan 2 ports 4. But once I hit enter, the whole router hangs and I have to power cycle and after the power cycle, the command did not take effect.

I would need to know why the router hangs after the command? Appreciate any thoughts or comments.

Thanks.