Model :

Hardware Version :

Firmware Version :

ISP :

I have purchased 3 TP-LINK AP's. Two TL-WA801ND and one TL-WA901ND
My internet gateway (router) is VTECH NB-403 and it has Wireless service.
My goal is to support WIFI coverage to all the area
All the TP devices are connected to the router.
The gateway delivers IP by DHCP. The range is (10.0.0.1 to 10.0.0.199). The router has a static IP 10.0.0.138.
I have installed all of the AP's as AP mode.
I gave every device a static IP (10.0.0.200, 10.0.0.201, 10.0.0.202)
I disabled DHCP service in all of TP devices so the client can receive its IP from the VTECH router.
I gave all the AP and the router the same SSID and password to enable and to facilitate roaming from space to another.
Initially, at the installation, process clients could connect the closest AP and take received IP and there was an internet connection. Everything was good
At some point, problems of internet connection start to occur and in some situation, clients connected to the AP and took IP but no Internet.
In other situations, when clients moved from space to another, internet disconnected and the signal was weak.
Can you please help me and guide me what I have configured wrong ?.
What is the best practice for my situation?
Any suggestion is appreciated