Normally a slowly moving pedal, either clutch or brake means bad master. This is especially true if you are not loosing any fluid.
Next time it happens, try this. Stomp it hard and hold it with a lot of pressure. If it then is holding solid then it is likely a bad master. One of the first signs of a bad master is leakage at low pressure. When you hit the pedal hard, the pressure goes up and the seals hold. I one time had to drive by stabbing the clutch fast everytime I shifted to make the clutch work.
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