Resistance and the resistivity depends upon the thermal factor that is temperature and the nature of the material used. The resistance is directly proportional to temperature hence as resistance increases with the increase in temperature of the conductor. Resistivity is also directly proportional to temperature. Hence resistivity also increases but for semiconductors it decreases.
There fore at high temperatures the free electrons start moving at a greater speed and the heat evolved increases. Hence there is more chance of short-circuiting at high temperature. So the given explanation is apt for the statement provided.