Glitches are so common now they don’t always make the news.

Glitches don’t have an immediate, obvious cause but nonetheless can cause frustrating problems. From customs and border protection terminals going dark to technical malfunctions on assembly lines, glitches affect every industry. And now, they’re popping up in our homes, too.

In the summer of 2019, at-home exercise platform Peloton pushed several updates to its smart stationary bike that resulted in weird closed captioning and exercise classes that would suddenly drop out—even with a strong internet connection. With so many people working on complex systems, errors no one planned for are causing major headaches.

Glitches often have to do with degraded network connectivity or a miscalculation of the bandwidth needed. But a lot of times, glitches result from newer technologies that can break in unexpected ways.