Hi , i connected 2 CPE 510 and the conf is as below.

CPE_AP 
STATIC IP 192.168.2.3
GW: 192.168.2.1 

CPE_CLIENT
STATIC IP 192_1682.8

GW:192.168.2.1

ISP MODEM -> CPE_AP -> CPE_CLIENT -> TP_LINK ACCESS POINT 

This happened 4-5 times so far . Client loses connectivity from AP. 

It works normal for 2-3 days and then it loses connectivity .

Any thoughs ? Distance between 2 devices is around 200 meters.