Why has my dog become such a sissy?

I say that lovingly lol. My GSD is 6 years old. She has never been afraid of loud noises, thunder, fireworks, etc. But within the last year or so she's very jumpy around certain things (smoke detector, microwave beeping, loud phone notifications, etc.). She jumps up from wherever she is, runs to my side and... show more I say that lovingly lol. My GSD is 6 years old. She has never been afraid of loud noises, thunder, fireworks, etc. But within the last year or so she's very jumpy around certain things (smoke detector, microwave beeping, loud phone notifications, etc.). She jumps up from wherever she is, runs to my side and trembles for a good 5 minutes before being totally cool again. She's still totally fine with thunder and fireworks. Is this just a weird quirk that didn't show up until later or indicative of something else? Anyone have experience with a dog like this?
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