Most likely a bad unit. It was likely caused by a failing component like a transistor or IC with bad silicon doping characteristics which didn't pass QA at the factory, but they used it anyway, to cut costs, and even the slightest mechanical shock would move just enough doping atoms in the component's silicon to push it over the threshold of failure. It was just waiting for any excuse to finish breaking. Probably would have eventually failed even without the drop. The mechanical shock of a 5 foot drop can be large for a heavy object, but a small lightweight object (like the Seek Thermal camera) impacts with very little force when dropped from 5 feet. Even if the surface it is dropped onto is concrete. Circuit boards are made with soldered components. To mechanically force a solder connection to come undone, would require an absolutely HUGE impact, like running it over with a car. The plastic case on electronic devices will crack LONG before the mechanical stress is enough to pop components off of their solder connection on the circuit board.