yep unplugging cable used to work with my old laptop but not this one.
anyways Ill get it checked even though am 99% sure there's no stray current there because I use the same extension connected to the same socket for my treadmill machine, hair dryer, phone charger etc etc. maybe when more than one cable is plugged in it affects on the power or something :/
currently its working fine even yesterday there was no problem at all. thanks for the reply
@TSingh.