Wifi turns itself on-off randomly


my brother's macbook air kinda useless.
first problem is, macbook can't turned on, happens every ~once in month, (charger green, screen black)but think didn't since summer. when happens, after couple of hours of trying, smc reset, power button long press, macbook turns on.

other problem wifi. started month ago. wifi randomly turns off, on, , macbook can't used web browsing. sometime good, sometimes, wifi useless.

here wifi log, think hardware problem, (i suspect smc wild guess me)

, real problem lives in bermuda , there no official apple service provider, when came home week, (the wifi problem was'nt present yet) apple said didn't find anything. annoying machine unreliable since ~the second month got is. when comes home again, 1 year warranty expire.


question wifi, think can problem, , if have advice warranty/repairing machine, glad.
 

attached files:

well, there wifi problem 3 4 os x ago. assume you’re date, right?
 


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