Usually there are no warning signs before the belt fails. The timing belt is rubber and most of the time things will run fine and the belt will fail. I have seen at times the belt slip or skip a tooth, but that is not typical. If you have any concerns about the timing belt you should have it replaced to avoid the possibility of doing engine damage if the belt breaks.
98 honda civic lx told my timing belt is skiping time it candrive on freeway no problem when i comes to doing under 40miles and under the car shuts off and in 10 mins of sitting it stars back up i was told its the timing belt