There are a lot of pieces to the grid and weakness in any of them can cause a power outage to your house. We have not had an outage of over two seconds since 2011 at our place. You can tell that there's a short outage when some appliances stay on and some don't. We have undeground wiring and the line in is on a main street. The power company does a great job keeping branches trimmed and adding support poles when needed.

So it could be a local issue or even an issue on your property. Or it could be an issue on your street or elsewhere.