Clutch pedal Knarzt/severe

Hello together, I drive a Citroen C4 from 2011 with almost 100,000km. I now have the problem that at Stop & Go traffic the clutch pedal starts to creak after some time and comes back harder or hangs. Then make as nice hopser as if you let the clutch come too fast. If I don’t have to step the clutch for some time then the problem disappears again. Does anyone know what that could be?