If your speed is still good, then signal strength should not be worth worrying about.
I suggest noting all the times the internet drops, and for how long, so you can discuss with a tech. The issue could be outside your house, rather than inside, so some investigation may need to occur.
Are you on Fibre or copper lines to your router?
Then there could be problems with the line outside your house. I had similar issues many years ago, which was addressed by the tech switching pairs in the line between the tub at the street, and the house.