"We acknowledge the existance of issues X, Y and Z and are working on it. We apologize for the inconvenience we caused"
See, if you keep mum the impression is that you're being haughty and arrogant, too good to speak with the plebs buying your products about your lapses in quality control even if that's not true and there are other reasons. Not having anything to work with and people will automatically default to the worst possible explanation.
It's that simpe. One sentence in one sticky. One.
How about it, CA?