Well, if Eren was using the shower as a way to combat the cold feeling, that would make sense as to why there is no hot water left..

[But Hange fails to see how it implies that Levi is also suffering from the same condition.]

Huh? The roomba? I thought he liked it.

[Its not like he sings the machines praises, but no news is often good news when it comes to Levi.]

Maybe it's bumping in to too many things because of how busy the apartment is?