You described exactly how a system that is loosing its charge behaves over a several day period. Soon, the clutch won't engage at all.
Take it back to the shop since it's still leaking.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
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