Plumbing is something most of us take for granted—until there’s a problem, at which point things can get messy fast. Likewise for the “plumbing” of modern financial systems: the money markets, where banks and other financial institutions make short-term loans to each other.

So given the strains China’s economy is already laboring under—including a slow-motion property sector implosion and the “serious” insolvency of Zhongzhi Enterprise Group, a large asset manager, in its own words—it isn’t a great sign that China’s money markets have recently been throwing off little blips of distress too.