***Possible solutions***
* ***Run memory test***
To launch the Windows Memory Diagnostic tool, ***open the Start menu, type "Windows Memory Diagnostic", and press Enter***. You can also press Windows Key+R, type "mdsched.exe" into the Run dialog that appears, and press Enter.
* ***Corrupted Drivers***
If the problem doesn't happen while in the ***BIOS*** settings screen (usually pressing the F2 key after pressing the power button) I would suspect a corrupted driver. First of all see if any drivers are corrupted by checking in the Device Manger. I would start with the Bluetooth. Just uninstall but don't delete the drivers and let Windows reinstall by clicking on Action > Scan for Hardware changes up in the menu.
* ***Defective Easily Removeable Hardware Components***
If that doesn't work hopefully it is just an easily removeable hardware component with an intermittant failure. Try removing one at a time and testing each time. I would start with the ***RAM***. For the RAM remove modules (usually there are two) one at a time and also try in each individual ones in each slot. Then ***Bluetooth***, ***Wi-Fi***, etc. Even an intermittantly defective hard drive could cause the problem.
The IFIXIT Repairs Guides will help with disassembling. Click on the blue text below.
[[Topic:Acer Aspire 4520-5464|Acer Aspire 4520-5464 Repair Guides|new_window=true]]
Let us know how it goes.