TL-WA850RE v1.2 randomly loses connection.

TL-WA850RE v1.2 randomly loses connection.

TL-WA850RE v1.2 randomly loses connection.
TL-WA850RE v1.2 randomly loses connection.
Monday
Model: TL-WA850RE  
Hardware Version: V1
Firmware Version: 3.14.8 Build 141224 Rel.38157n

My extender loses connection on some days.   The entire "right side" LED flash than, they are all blue not sure what that means.  The log shows some connection errors. An Example below.  In most cases I have to reboot the extender, per software or per power off/on cycle. I wonder if I can change something in the connection parameter to make the connection more stable. 
 

129 Feb 15 20:19:45 NTP INFO NTP connection success, connected to the internet
128 Feb 15 20:19:45 DNS ERROR DNS probing failed, DUT can not get a dns server
127 Feb 15 20:19:13 NTP ERROR NTP connection fail, no connection to the internet
126 Feb 15 20:19:13 DNS ERROR DNS probing failed, DUT can not get a dns server
125 Feb 15 20:16:45 WIRELESS INFO Key negotiation successfully
124 Feb 15 19:41:18 NTP INFO NTP connection success, connected to the internet
123 Feb 15 19:41:18 DNS ERROR DNS probing failed, DUT can not get a dns server
122 Feb 15 19:41:16 NTP ERROR NTP connection fail, no connection to the internet
121 Feb 15 19:41:16 DNS ERROR DNS probing failed, DUT can not get a dns server
120 Feb 15 19:39:45 NTP INFO NTP connection success, connected to the internet
119 Feb 15 19:39:45 DNS ERROR DNS probing failed, DUT can not get a dns server
118 Feb 15 19:39:08 NTP ERROR NTP connection fail, no connection to the internet
117 Feb 15 19:39:08 DNS ERROR DNS probing failed, DUT can not get a dns server
116 Feb 15 19:16:46 WIRELESS INFO Key negotiation successfully
115 Feb 15 18:16:46 WIRELESS INFO Key negotiation successfully
 
  0      
  0      
#1
Options