Freezes when pressure is applied to the central left underside.

Cracked logic board, or shorting against the bent bottom of the case. Remove the bottom and ensure that it is not bent or dished upward. The bottoms are aluminum and can be deformed easily - that also means it's easy to push/flatten back into place. Wood blocks or auto body tools can straighten an case deformity quickly and easily.

If you see no uniformity look for a cracked or lose component. That side of the board has the CPU heat sink & fan also the HD. Check over those parts & connectors.

STOP FLEXING/crashing the board. You should not be walking around with computer in your hands it should be on a solid flat surface. Each time you cause a crash you risk/are doing more damage to the HD and possibly other computer parts.

If this answer is acceptable please remember to return and mark it accepted.