Had a similar problem a couple of months ago. Following the instructions on MagicMirror Wiki page, I enabled the Full KMS OpenGL driver instead of using the fake one. As my setup is vertically mounted, I used xrandr to rotate the display.
Finally, installed a cooling fan on Raspberry Pi. No problem since then.

@striiker I am having the exact same problem. Screen goes black every 6-8 hours with just the pointer showing. I have to reload/restart the Magic Mirror then. This started to happen after upgrade to version 2.4.0
I have upgraded to 2.5.0 but the issue remains the same.
I am still trying to figure out the solution; just wanted to share with you that you are not the only one facing this problem!

@myfingersarecold
Thank you for the suggestion. I have installed the MPlayer and your module. The mp3 file is now playing by replacing the omxplayer with either VLC or MPlayer in node.helper.js of the affected module.
Thank you once again.