The bridge EA6700 and WUMC710 troubles

Hi,
The bridge EA6700 (1.1.40.153731) and WUMC710 (1.0.01 build 18).
Distance - 5 m - direct visibility
Network range 5.0 GHz
Only Wireless-AC
Channel Width - 80 MHz
Channel - 44 - 5.220 GHz
Problems are found:
periodically drops wireless network connection - once per 1-2 days
signal quality poor
status WUMC710
Radio Band: 5 GHz Channel Width: 80MHz Channel: 44 Bit Rate: 1053 Mbps Signal: 54%