[jrumbut]

Is there a particularly high failure rate with these missiles or is this a widespread problem in systems where the engine ignites after launch?

What do they do after? Is the site repaired? Scrapped?

[PaulHoule]

Most accounts are that those failures are "rare"; the missile is sealed in a canister so it's likely to be a defective missile from the factory, not some mistake on the part of the operators.

It happens enough that there are a handful of videos on Youtube. Similar failures happen with vertically launched missiles from ships

https://www.youtube.com/watch?v=ydsm1uzkNu4