Shut down problem?

MacBook Air 13" Mid 2012 (standard configs from store bought)
Yosmite 10.10.1 w/ bootcamp Windows 7

Prior Problem:

Random shut downs without power source connected

Problem:

1. Shut down when closing lid for an amount of time without trying to shut down
purposely.

2. Every time I turn on the computer, it wakes with two log in option me & guest. I enter my password and it has a loading bar? Why is that? This happens when I shut down properly as well or restart and it loads with a loading bar. This never happened prior to bootcamp or it started to happen after an update as well (maybe the 2nd recent update from the last one that happened which didn't help)

SandboxGeneral said:

The random shutdowns sounds like a battery that isn't properly calibrated and needs to be replaced.

As for the progress bar, that was introduced with Yosemite and you may not have noticed it at first.

Click to expand...

Okay thanks for the loading bar insight even with bootcamp installed guys, but it still doesn't answer my issue with restart with lid down. My power options are preventing that from sleep but shutting down is completely different. I still have a lot of battery left when booting back up from that shut down.

Macbooks with built in battery http://support.apple.com/kb/PH14087 & http://macs.about.com/od/usingyourmac/qt/battery-calibration.htm

1. says the ways to callibrate your battery can be done seems so by yourself and doesn't require to be done at apple store. My macbook air is out of warranty btw.