Do coaches call too many timeouts? Yes. This is what happens when your team is left without one when needed.
San Francisco, trailing Gonzaga by three points with 9.7 seconds to play, steals the Bulldogs' inbounds pass. A Dons player calls timeout but there's a problem. San Francisco had used all of its timeouts.
The Dons were assessed a technical foul, ending their chances of victory.
The lesson here is that it's always good to have a timeout in pocket in case the unexpected happens.