This weekend, it's kinda mid-season, and the weather was iffy so I pulled the chains off 4 bikes to clean and re-wax. On one, when I pulled the chain out of the wax, one end was hanging low instead of on the usual "dipping loop". Looking closer, at the end, there were two plates -- but no roller between them? I was able to fish the errant roller out of the wax, but presume the chain is toast. Is this a common failure? The chain is a PC-870, not like it's off-brand, perhaps 1000 miles, unsure how many waxings from new. Maybe I over-agitated when swishing the chain around in the hot wax.