Game Freezes white screen

I just got myself a affordable mini PC and decent wide screen monitor so I can enjoy the Sims more with less lag and loading times. 

I've have been getting a random issue of the game freezing to a white screen when I get up from the desk and the screen ends up shaking a bit from the vibration. It's like the cord is wiggling a bit a disconnecting for a split second, which is negatively impacts the game. I've only noticed while playing the sims and if I haven't saved I lose progress since the save short cuts won't work, and I am unable to do anything but restart the PC from the start menu. Task manager won't work to close the program at all. 

Obviously the power cord has something to do with it but why would the game be the only thing effected