Answer:
The listening problem you are experiencing is situational distraction
Step-by-step explanation:
Anything that changes or digress the focus of a person or group of people from a particular subject and thereby reducing the reception of desired information is regarded as distraction.
Though, the professor fixed the projector for the second time; but because one's mind has been occupied with the situation and/or thought that the projector would fluctuate again, that's why it's difficult to get focused.
The above description refers to situational distraction.