That happened to me, not a Symfonie one but a nice mahogany one, not the same size as yours unfortunately. It is annoying, I now keep the other one as a spare.
I ordered some Symfonie ones with a voucher I was given for Christmas; so far I haven't really used them (too busy, keep putting it off as they are so nice, silly reasons) so am looking forward to using them. I just need to remember not to stumble and tread on my knitting bag as that is how the other one snapped!
Does anyone have an odd 3.75 mm 35cm long KnitPro Symfonie needle. They are so expensive and I am reluctant to buy a new pair if there's a chance someone could sell me just an odd one. I had been knitting a wee dress for a friend's baby and laid the knitting on the sofa. Unfortunately the dog decided to play tag with the kitten and jumped onto the sofa to chase him, landed on the needles and snapped one