Some stupid little thing is always malfunctioning.

Holes in panels are a potential fire hazard if a malfunction ever occurs inside the panel.

It makes me believe that their eyes and calculators are malfunctioning.

Tenant agrees to allow Landlord timely access to premises to do maintenance and repair.Tenant will notify Landlord in a timely manner of any damages or problems as they arise, including damages caused by Tenant, malfunction of appliances or fixtures, and water/moisture leaks and spots.Tenant will take care of the premises, keeping them clean and clear of debris.In your case, the tenant may have been oblivious to what was happening, or saw it and didn't care to tell you.

You pay if something malfunctions that isn't the fault of the tenant.

I have a family member who was pulling into their apartment complex in San Diego, CA which has a sensors to notify the swinging gate to open and when it is safe to close, which malfunctioned. 

That timer will mysteriously malfunction.

We put a set of keys in a lock box on the backdoor in case there's malfunctions.

Tenant shall replace any burned out or malfunctioning light bulbs.

The plumber determined that while there was no malfunction with the hot water heater, it did take some time for it to heat up once running water was initiated.