25 second blackouts are too much. However a 1 second blackout every 5 minutes might not be a problem in most cases: you can keep going the direction you are going and other cars that are not blacked out will avoid yours while the computer recovers. Of course this depends on the blackout - if the car is still steering itself but not looking for problems (a much easier problem) it works, if the car isn't steering itself it could run into a wall.
OTOH, if it means that the vehicle is liable to have a 25-second "blackout" in the middle of your morning commute roughly once a month, it seems very different.