ROS4.0b3-when AP disable and enable card then CPE disconnect

Hi,
AP hardware: 433AUH, + R52N (AP), CPE: 411+R52N, all with ROS 4.0 beta 3

AP card configured as ap bridge , nstreme and polling enabled, CPE as station , Nstreme and poling EN.

When AP and CPE is power on then all OK but when I disable and enable card on AP then CPE disconnecting and connecting again with message:
On CPE: Lost Connection, not polled for too long, on AP: disconnected, extensive data lost.
And this disconnection repeat every 30-60 secounds again, and again.

STOP disconnecting when I reboot CPE then CPE connected and all ok until I again change configuration on AP or diable/enable.

On AP and CPE interface mode 802.11a, not N
cpe.jpg
ap.jpg