Whats Wrong with my Coffee and Banana Plant?

[pax12]

My coffee plant- some leaves turned a tan color and dry and fall off.

Banana plant- leaves have black spots and turn black and dry up.

Video- http://www.youtube.com/watch?v=cZpgr1i4rNA&feature=youtu.be

 

[GardenGeisha]

Did you ever find out what was wrong with them?