Macbook Pro randomly sleeps or dies

Question

I have a mid 2012 Macbook Pro Retina 2.3 GHz
The problem:
While using my macbook, the screen will randomly go blank like its gone to sleep. I then press the power button and get the red and black dead battery symbol on the screen. I plug in the charger and it comes back on normally but the battery will not be dead - its normally on between (25%-35%).
I have given my Macbook Pro into an Apple Store and an Authorised Repair Centre. Both of them refused to do anything because they couldn't replicate the problem. The Apple store ran a system health check in front of me and everything returned normal including the battery. I tried to explain that it happens randomly with no specific application running. It has happened most times when I'm browsing the internet using Chrome so I switched to safari and it still happened and once it happened when playing Football Manager 2015.
I have tried a clean install of OS X and resetting the SMC and PRAM, but none have made a difference. The problem occurred on both Mavericks and Yosemite.
(I still have my extended apple care.)
Any solutions?
Thanks

Answer 1

Really? Badluck with MacKeeper I take it? 
The Apple Tech said my battery shouldn't be bad and should have around 1,000 cycles left. Should I go ahead and replace it if it isn't registering?
Here is what it is showing;
Battery Information:
  Model Information:
  Serial Number:    D86222305WADGDLBU
  Manufacturer:    SMP
  Device Name:    bq20z451
  Pack Lot Code:    0
  PCB Lot Code:    0
  Firmware Version:    406
  Hardware Revision:    2
  Cell Revision:    158
  Charge Information:
  Charge Remaining (mAh):    6759
  Fully Charged:    Yes
  Charging:    No
  Full Charge Capacity (mAh):    6759
  Health Information:
  Cycle Count:    237
  Condition:    Replace Now
  Battery Installed:    Yes
  Amperage (mA):    298
  Voltage (mV):    12581
System Power Settings:
  AC Power:
  System Sleep Timer (Minutes):    10
  Disk Sleep Timer (Minutes):    10
  Display Sleep Timer (Minutes):    10
  Wake on AC Change:    No
  Wake on Clamshell Open:    Yes
  Wake on LAN:    Yes
  Current Power Source:    Yes
  Display Sleep Uses Dim:    Yes
  GPUSwitch:    2
  PrioritizeNetworkReachabilityOverSleep:    0
  Standby Delay:    4200
  Standby Enabled:    0
  Battery Power:
  System Sleep Timer (Minutes):    10
  Disk Sleep Timer (Minutes):    10
  Display Sleep Timer (Minutes):    2
  Wake on AC Change:    No
  Wake on Clamshell Open:    Yes
  Display Sleep Uses Dim:    Yes
  GPUSwitch:    2
  Reduce Brightness:    Yes
  Standby Delay:    4200
  Standby Enabled:    0
Hardware Configuration:
  UPS Installed:    No
AC Charger Information:
  Connected:    Yes
  ID:    0x0100
  Wattage (W):    85
  Revision:    0x0000
  Family:    0x0085
  Serial Number:    0x005e8cc4
  Charging:    No