My Connection getting very unstable, some of the device connected and some not. Everytime this happened i need to reboot the device via http://tplinkmodem.net/, even the hard reboot from the device won't work.
Not sure if this is related to the firm ware that I am using, which is very old. Please can you advise how I can upgrade the firmware?
We can confirm that your modem/router has the latest firmware available.
If you are experiencing issues via WiFi connection, then signal interference may be causing it.
Check these articles that may help improve your home WiFi network.
Let us know how it goes.