Its 10 days in a row in which the equipment must show 95% reliability. So for example, if you get 9 days of perfect reliability followed by 1 of 90%, you must restart all days.
As for what 95% means, I have my doubts that means 5% of trips will have a noticeable issue. It probably includes things like trains throwing up faults that don’t affect service necessarily. Ill see if I can get a better explanation from a friend.