I would report it only if I not not receive good support from the manufacturer.
My Animas pump failed once. I called on a Sunday and they had a replacement pump to me first thing on Tuesday.
I was trained behave as if to expect my pump to fail and always have a backup solution.
It is a complex machine with has to put up with quite a rigorous lifestyle 24 x 7 so I am not surprised by the a rare failure.
Thinking about this more, my expectation is that a failure should always result in less (or no) insulin being given and with frequent testing (as advised), a rise in BG should be detected in time to do something about it.
If the pump problem resulted in extra insulin being delivered this is potentially fatal in a very short period of time and should be addressed by the regulator.