It's there for many reasons. I did run into someone that thought it would extend the battery life span and well, their PC woes never seemed to end. Your story seems to be on track with theirs.
It sounds like the machine needs repair. Hope it's in warranty.
I have huge problem which is driving me nuts. My laptop (Lenovo Y580) isn't charging well. It randomly disconnects AC adaptor. I'll try to discribe this situation in detail:
First time it was about 6 months ago. I was using my laptop without battery (i think i was playing Skyrim or something) and my laptop just turn off (immediately, just black screen and completly off at that point). I thought it was no big deal, so i powered up laptop again and enjoyed my gameplay. After few days it happened again. And it was happening often and often. Until my laptop started doing this even when i was using word or surfing the web or even wasn't doing anything. Then i plugged my battery in. What i realized, that my laptop just disconnect AC and at the front/bottom where the indication lights are, the solid white battery light (2nd from left) turns into blinking red/orange. So i plug off AC and stick it right back and laptop is charging again. But i can't do this everytime it happens, it is really frustrating and messes with laptop's performance.
Basically i can't use my laptop normaly. Somethimes it stays powered half of day without any faults (ofcourse i'm not talking about gaming, i forgot it long time ago), sometimes it disconnect charging 2-3 times per minute.
Here is what i tried to do:
-Clean everything inside my laptop (dust, dirt)
-Reapply thermal compound
-Power drain (when battery and AC isn't plugged and laptop is turned off, you hold power buttom for about 30 sec)
-Voltage check on AC adaptor
-Voltage check from AC jack to connection to motherboard
I can't find anything. So maybe someone encountered this problem or have a solution for this? I really need help Thank You