I don't mean to be blunt or dismissive, but the pressure in the veins/arteries has nothing to do with (a) the thickness/elasticity of the wall tissue, (b) the diameter of the arteries/veins, or (c) the number of (branches of) arteries/veins.
This can either be caused by a more prominent maxilla (upper jaw) or a retruded mandible (lower jaw further back than it should be). This causes a discrepancy in how all teeth contact, and can manifest as an increased overjet. An increased overjet can also be caused by a discrepancy in the number of teeth, or the length of the arch.
The most common cause of truly random crashes is an overheating computer. The most common cause of an overheating computer is blocked airflow through the computer, followed by a failing or failed fan. You probably know that there are fans in your computer whose job it is to move cooler air throughout so as to cool down the components therein.