The accessories offered some excitement, too: heeled ankle - strap sandals in a combination of colored plaids; clutches covered in rows of bright plastic flowers; a spin on Dr. Scholls's buckled sandal in glittery and white - lacquer finishes; and layers of colorful statement jewelry, usually floral. (fashionista.com)
Self - adjusting clutch cover (SAC) adopted for the first time; Cover maintains a constant diaphragm spring orientation to keep the pedal force required to disengage the clutch at a constant level (toyota-global.com)
A weak or worn clutch cover can do it, as can the pressure plate if say a spring has failed or they've become weak, but as you say the clutch has been replaced already I think unless the new parts were faulty (which does happen) you could be looking at perhaps an oil contamination issue on the clutch if the rear main oil seal is leaking. (mechanics.stackexchange.com)