Murphys law says anything with 22 moving parts including a timing cord hanging out there...that eventually there WILL be a failure...
Missed out on several good critters to moving part rests hence why I am still a huge fan of Ugly Cookie / WB...zero moving parts...
As with any rest set up correctly the Ugly Cookie is quite and super accurate...
With a drop away or rest that has moving parts
never use commerial spray lubicants or oils, as they can seize up when dirty or in cooler weather, which may have been the case here...
Use a powdered graphite for lube...same goes for entire bow tackle, if we need a lubicant we only use powdered graphite [only exception is we use lithium grease on limb bolts when bow is torn down]...
amazing stuff that doesnt freeze or build up dirt...
Neil