Lezyne STVZO Alert Rear Light

[jbrescia]

So I swapped the rear light on my wife's Trek Verve + about 4 months ago to a Lezyne STVZO Alert. It worked as expected for a few months, but now the LEDs are very dim and not nearly as bright as they once were. Connections all still look fine, no software or other hardware was updated, and the motor and battery are in great shape. It has a Bosch Active Line Motor with a 500 Powerpack. What should I be looking for or testing? Thanks!