True story: back in the DOS days, I used to do PC hardware consulting, and one of our clients had a desktop box that "only worked Monday thru Thursday" - and would mysteriously be totally dead on Fridays, but work again on Monday.
We took to box back to our workbench, opened it - and it had a quarter inch of dirt and small rocks all over the motherboard. Took it out to the driveway and used the garden hose to clean it out, then let it dry in the sun. Worked fine after it dried.
Turns out they had a plant service that came in watering the plants Thursday evening - and the PC in question would get hit by the watering overflow, complete with some potting soil, which got into the case via the vents and shorted out the PC - until it dried over the weekend.
We moved the plant.
They quite literally don't make them like they used to.