1)when things run too hot, it will wear it down faster. ur component is most likely dying due to the frequent heat stress.
2)running ssd? any settings changed? installed any power applications?
3)battery cell probably depleted. readings say >50% but it is reading based on <5% of current capacity.

best use the stock wifi drivers if u got a problem or 1 patch after
never install microsoft recommended drivers in windows update unless necessary

keep trying I guess. worse it might be the wifi card itself 

lol not me.. referring to Acher13
mine no problem so far (touch wood), i take good care..
shop guy bullcrapping...
our laptop so easy to take apart.
there is even a youtube video on how to do that

but overall, u might have a lemon unit with you..
battery if new till now like that means faulty, but if recently means board might be damaged.
wifi adapter roll back and restore stock driver still like that means component problem.
if not mistaken RM80 or less can replace.

This works for me.
Tap on keyboard, not mouse move.

while the laptop is sleeping, press any keys on the keyboard to wake it.
Don't use mouse clicks.

That is what he meant.