Every 1 to 3 rides, when I start my 1040 solar, either the headlight or taillight will fail to sync. I can restart the 1040 and that may work (note that I restart nearly every 1 to 3 rides due to this). Another fix is to unpair and re-pair. Sometimes, it will look like either light pairs, but will end up shutting off a few minutes into my ride. This is a huge safety issue since I commute on my bike and depend on, at a minimum, lights for safety.