It's a problem...
It doesn't always correlate that the bigger the visible challenge, the bigger the leak as even small leaks can cause major damage. The best option for roof refurbishment is to identify when a roof is reaching the end of its serviceable life and take proactive action before water ingress occurs. Carrying out a roof survey will identify the condition of your roof so that you can make an informed decision about proactive action.
Here are some common reasons for roof failure.