More to the point is it acceptable ?

No, but I may be spoiled. Where I grew up, we were just a stone's
throw from a major utilty substation; we lost power once in 20 years.

Make sure your alarm clock has a good battery in it.

Amazingly, it does. Haven't changed it in years.

Report this to your power company and see if they can tell you what
the
cause was. It might be an under rated transformer that should be
upgraded.

I was thinking about it, but was looking for some ammo before I talked
with anyone.

Thanks