Channel interference. Try different channels and use channel width 20MHz (HT20).

Also, if you are using 7210 as a AP client router, it is a client device, you should both ends to ensure a stable link. What is the device at AP side? Have you adjusted the settings and position of that device?

AP-Client router mode sucks cause is a repeating mode
Set Client mode it's like laying a imaginary cable between devices, for wireless on Client side just add a cheap router as AP

im so sorry my laptop had been broken this couple weeks, and i also can't access internet

zetm wrote

Channel interference. Try different channels and use channel width 20MHz (HT20).

Also, if you are using 7210 as a AP client router, it is a client device, you should both ends to ensure a stable link. What is the device at AP side? Have you adjusted the settings and position of that device?

i don't really pay attention before but since you mention it i noticed something
my signal actually always stable at night, at 17 - 21db between 10pm to 9am
then i realize it's because damn cafe across the street (it's literally 10meters from my house), every time they turn the wifi on (they have two routers), my signal begin to dropping low to 8-12db and get worse when the cafe is full of people

7210 AP client mode can not set channel setting manually, it's automatically assign it's always like this http://prntscr.com/7h270h
i have no access to the AP side, im just using the internet, it's like public internet but they use triangle tower, and i can see they use grid antenna but im not sure what device they use,,

im still thinking about add external grid antenna TL-ANT2424B,but it's quite pricey im afraid if it's can't fix my problem
what you think?

AP-Client router mode sucks cause is a repeating mode
Set Client mode it's like laying a imaginary cable between devices, for wireless on Client side just add a cheap router as AP

unfortunately i only can set to AP-client mode, it's a public wifi and has some restricted rule accesss