My macbook air won't turn on but then sometimes it turns on by itself

My macbook air 2013 purchased 5 months ago has been experiencing a very strange set of circumstances of late. Regularly after going to sleep or being powered off it will not start up again. I have done many SMC resets and Pram Resets to no effect. This issue occured about a month ago in colombia where I had it repaired twice at authorized repair centres. The first time they disconnected the battery and reconnected it. * hours later i brought it back and 2 weeks later they had updated the firmware. That resolved the issue for about a month until these last three days when each morning, whether it had been sleeping or powered off it will not turn on no matter what type of power on i do. There is no sign of life.
Here's where it gets weird. For the past three days it has powered on without me touching it, at random and different times each day, after at least a few hours of failing to do so. Also, as of last night My charger light will only turn on while the computer is powered off. However the AC power still reads as connected and the computer runs off the AC power not draining the battery but not charging it either. Is my computer haunted?
The issue began with mavericks, but after the first time it powered on by itself three days ago I followed apple supports suggestions and upgraded to Yosemite the 10.10 version.
I have copied in the system report under the power settings at the bottom of this post and if anyone has any idea please let me know, I have a case open with apple but so far no answers have been found.
Also I have decided to try something today by scheduling a power on/ wake up for 9:00 am tomorrow, we will see if this will work.
For those who would suggest I go to an apple store that is not possible as I am in Ecuador and remaining in South america for the next two years. I can take it to an authorized repair center but am hesitant to wait another 10 days when the fix may not work, like the last few times in Colombia. Thanks for any help you can offer.
Luke
Battery Information:
Model Information:
Serial Number: D8642262U62F90KAC
Manufacturer: SMP
Device Name: bq20z451
Pack Lot Code: 0
PCB Lot Code: 0
Firmware Version: 511
Hardware Revision: 000a
Cell Revision: 1200
Charge Information:
Charge Remaining (mAh): 7083
Fully Charged: Yes
Charging: No
Full Charge Capacity (mAh): 7223
Health Information:
Cycle Count: 93
Condition: Normal
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 8483
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 10
Wake on AC Change: No
Wake on Clamshell Open: Yes
Wake on LAN: No
AutoPowerOff Delay: 14400
AutoPowerOff Enabled: 1
Current Power Source: Yes
DarkWakeBackgroundTasks: 0
Display Sleep Uses Dim: Yes
PrioritizeNetworkReachabilityOverSleep: 0
Standby Delay: 10800
Standby Enabled: 1
Battery Power:
System Sleep Timer (Minutes): 97
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 97
Wake on AC Change: No
Wake on Clamshell Open: Yes
AutoPowerOff Delay: 14400
AutoPowerOff Enabled: 1
DarkWakeBackgroundTasks: 0
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Standby Delay: 10800
Standby Enabled: 1
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
ID: 0x0000
Revision: 0x0000
Family: 0x0000
Serial Number: 0x00000000
Charging: No
Power Events:
Repeating Events:
Type: Wake or Power On
Time: 9:00 AM every day

See this article:
http://support.apple.com/kb/ht3964
Find the section that applies to your computer, and follow the instructions.
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

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