Odd power problem while gaming. I'm confused.

This problem is driving me nuts. I'm not even sure where to start to look for a resolution so I posted here.

I have a MSI GX740 laptop. My laptop vents are kept free of dust and I always use it with it plugged directly into a power source. I even recently bought a new cooling fan since my last one went out. Overall my laptop stays between 55 and 70 while gaming. So here is the problem.

Say I'm playing Elder scrolls on max graphics. Everything is fine, then all of a sudden, I guess the best way to explain this would be to say its like I'm getting a huge amount of lag out of nowhere. The game slows down and gets super sloppy. I'll minimize the game and notice that my power meeting shows I'm only on battery power. Despite the thing physically being plugged in. So I'll simply unplug the cord from the power brick, plug it right back in, then boom its back on AC and the problem is gone.

Ha what the hell? Any help on what I can do?

 

could be a number of things. your psu could be overheating or shorting out so switching to battery.
easiest way to find out is to totally remove the battery and run on mains and then if it turns off suddenly you know its either the psu or internal temperatures turning off to protect the hardware.
what spec have you got. cpu / gpu / ram / hard drives.

when was the last time you cleaned the fans and vents out inside the laptop as even though your temps above look fine they could be false readings depending on what monitor you are using.
what are you using to monitor your temps while gaming? lots of software in my sig below to try others to compare.

 

Sounds like your PSU dies off and you are consuming more power than it can give. Is your MSI modified? how much power is your PSU giving you? I had that exact same issue when I overvolted my GX660R GPU. I had to use a 150W PSU along an intel 920xm because the included 120W could not handle it.

 

Ok maybe I need to replace my psu. Do I need to get a certain one or does that matter?

 

is my post invisible?
if you can answer the above then we can give advice

 

I don't know what kind of connector that laptop has but go with a 180W or higher if you can find it. Just make sure the connector is the same and the Voltage is the same as the current one.