RMBP randomly shuts down - now with red battery indicator at 52%

For the past few days, my mid 2012 15" rMBP has been powering down or sleeping while in the middle of performing tasks, and more importantly when it's ABOVE 15% charge. Just today however, I now have a red battery indication at 52% and holding. The other day I did a search to find out what the issue might be and I didn't find any helpful info. At the time, I had an external monitor plugged into the thunderbolt port closest to the ac adaptor port. I was running Adobe Lightroom and Photoshop, but nothing else, and was not connected to the internet. I had turned wifi off. My problems continued until I plugged in. Once on a full charge, I unplugged and the same thing happened all over. Numerous times. So, I disconnected the external monitor, and thought that solved my problem. The next time I used the computer, I put the external monitor into the other TB port and did not have any issues, however I wasn't using the rMBP as extensively.
Today, again while performing tasks such as importing/exporting images with LR & PS, my laptop shut itself down. It runs warm, and fans are purring like crazy, but that's normal for the work I'm doing. Prior to the shut down, the battery read ~24%. I plugged in and woke it up. No external monitor is attached today. I am not running any other programs besides Chrome at the moment. I noticed a red battery light at 52% and it has not changed. Option clicking the indicator shows a "normal" condition.
Can anyone explain what is happening?
More information that might be helpful:
OS 10.8.5
2.6 ghz intel i7
16 GB 1600 MHz DDR3
250 GB SSD (with ~25GB free)
NVIDIA GeForce GT 650M 1024 MB
I have had a Speck hard shell case covering the laptop for a few weeks, but no issues until this week.
I am a pro photographer who shoots tethered on location and carries my rMBP around on assignment. It has never been dropped, or damaged in any way. I baby this thing!
This is my current system info:
Battery Information:
Model Information:
Serial Number:
Manufacturer:
Device Name:
Pack Lot Code: 0
PCB Lot Code: 0
Firmware Version: 511
Hardware Revision: 000a
Cell Revision: 1150
Charge Information:
Charge Remaining (mAh): 3455
Fully Charged: No
Charging: No
Full Charge Capacity (mAh): 7431
Health Information:
Cycle Count: 533
Condition: Normal
Battery Installed: Yes
Amperage (mA): -2533
Voltage (mV): 10719
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 15
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
DarkWakeBackgroundTasks: 0
Display Sleep Uses Dim: Yes
GPUSwitch: 2
PrioritizeNetworkReachabilityOverSleep: 0
Standby Delay: 4200
Standby Enabled: 1
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 0
Display Sleep Timer (Minutes): 5
Wake on AC Change: No
Wake on Clamshell Open: Yes
AutoPowerOff Delay: 14400
AutoPowerOff Enabled: 1
Current Power Source: Yes
DarkWakeBackgroundTasks: 0
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Reduce Brightness: Yes
Standby Delay: 4200
Standby Enabled: 1
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: No
Charging: No

No one else is having this problem at all? Or knows anything about it?

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