I bridged ether ports 2-9 on RB493G, bridge ip is 192.168.40.1/23. Ether 2 is connected to AP1 (RB912UAG-2HPnD) with bridged ether 1 and wlan1, bridge ip is 192.168.40.2/23. Ether 5 is connected to AP2 (RB912UAG-2HPnD) with bridged ether 1 and wlan1, bridge ip is 192.168.43.2/23.

Problem is when I try to ping AP1 and AP2, some pings are successful but some not, average of loss packet is about 64%.

What is the problem?