Hi sifus, need help with my internet connection.

I just realized my wifi connection on my mobile devices/laptop are never on their full potential speed which is 500mbps, which i can achieve by plugging in ethernet cable.

Is this normal? is there a way to achieve higher speed?

So the DIR 850L and the silver modem from TM will not support 300MBps WiFi?

Will I have to replace both modem and router to enjoy the full potential of the 500MBps plan.

I have another issue which is my wifi keep disconnecting itself and reconnecting after I installed the new firmware for the DIR850L.

Result from Ookla Speedtest

Wired connection on PC
493M download
107M upload

Wi-Fi 2.4Ghz on phone
72M download
60M upload

Wi-Fi 5Ghz turned off because I don't know if it is causing my phone to keep getting disconnected and reconnecting by itself.