(Acer laptop) Webcam doesn't always work

Hello again! I’ve got problems with my webcam. Here’s the thing, It sometimes shows up in lsusb, but usually is absent. I can’t tell what triggers this behavior.

I tried out Guvcview and the webcam worked just fine, so I highly doubt it’s a hardware issue. But then it stopped working again. By the way, it’s a “Chicony Electronics HD WebCam”. Thanks in advance!