Two distinct possibilities:

1. Conductors with different thermal expansion coefficients and/or cold solder joint/s. BGA chips (ie graphics) especially. Reballing BGAs is no simple procedure to prevent popcorning, thermal damage and cold joints.

2. Condensation - I have an A1278 non-Retina MBP that I'm donating that, for 5 years now, refuses to recognize the boot drive if it's warmed up too quickly. I suspect corrosion resistance and/or a short from condensation somewhere along the SATA path or a signal feeding a chip that provides it. I've tried using a pencil eraser on the male and female SATA connector contacts to no avail. I bet Louis Rossmann could fix it for $180-350 but I already bought a Lenovo T480.