Screenshot FP6 not possible

Since a week or so I cannot take screenshots with my FP6 anymore using the power button and volume down. I double checked the settings for gestures and turned it off and on again but no luck.

When I try to take a screenshot, it gives a slight vibration and nothing else, as if it is blocked in a way. It does show the volume. What is this issue and are there more people experiencing this?

A post was merged into an existing topic: Taking screenshots when locking the phone