Grabbed the Bosch Colt to route some slots. Drilled the starter holes and wasted the slot on the drill press. Inserted the Whiteside bit into the router, turned it on and gently turned it into the starter hole and the bit fell out. Thought I had it tight. Inserted the bit, made sure it was quite tight, turned on the router and gently turned it into the hoe and the bit fell out, again. Knew something wasn't right! Removed the collet nut and found...
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...collet had broken nicely into two pieces.
So thankful that no injuries were involved.
Must be common with these collets. Amazon even has replacements in stock.