after many years, i finally couldnt stand it any longer and decided to search for / and install another 3rd party custom firmware for my router to see if it fixes the problem of my network disconnecting for no apparent reason.

then found a reliable custom firmware to replace my previous laughable 'Ah Man' firmware. ( look at the name Ah Man, and you can probably guess how crappy it is )

administrator's interface is totally different ;
spent half-hour getting familiarize and portforwarding for my bittorent and other apps :D

till now, i've encounter no disconnection yet & enjoying every moment of solid/strong internet connection.
( because its a custom firmware, it gives the option to tweak and change the 'wireless transmission power' )

F.Y.I
Router Model: Linksys WRT54G V2.2