I have big problem with TL-WA701ND (ver 2.1) Access Points I bought yesterday. I am trying to setup multi SSID wifi network with VLANs and when I do so the router begin to restart in 30sec loop. My settings are:

1. On my switch I create VLAN 55, I add VLAN55 tagged to port 12. Port 12 has already configured default VLAN untagged, so now has one untagged and VLAN55 tagged.
2. On router, set operation mode to: Multi SSID, next I give router IP form untagged VLAN so I can access it, in wireless menu I create SSID: "BR0", enable VLANs and set VLAN ID: 55 for BR0.
3. Click save, reboot, after while I am connected to BR0 and I am able to ping IP from VLAN55 for a few seconds then router restarts, boot, work for few seconds and restart again, and so on .....
When I uncheck VLANs it works fine but I cannot use it this way.