From what you are describing it is the Clutch Master getting weak, It happens about as often as the slave cylinder dying except when the slave goes you will have no pedal at all.
The master cylinder is your issue right now, GTR fluid may help for a bit but you will be back for a master cylinder replacement soon after.
The GTR fluid is a higher viscosity (like motul RBF660, Pretty sure it's the same fluid) and will help the seals in the master seal better effectively putting a band-aid on the real problem (master cylinder)
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