Renault trafic clutch issue

[Meatball]

I've just brought a Renault trafic 115 on a 2010 plate it's done 28k. The problem is the clutch pedal intermittently drops to the floor? It's not loosing fluid, if I pull it up with my foot when driving its normal.
Bit odd? I spoke to a comercial van/lorry garage and he said they all do it? He's suggested fitting a bungee strap and replace the spring above the pedal !!
Can anyone shed some light on this.
Thanks

[Meatball]

Another suggestion they made was to loosen the clutch fluid cap and stick a cable tie to keep it on.
The can has 3 months warranty so I'm at a loss what to do.

[Meatball]

It's 250 miles away it was delivered to me. It's gonna be a lot of hassle. As most will know the warranty won't be worthy the paper it's written on.

[Meatball]

Like all these things they can't diagnose the fault without dropping the gearbox. I know what your saying.
The reason for the post was to see if the mechanics story about they all do that stands up ph collective

[Meatball]

Nice one thanks

[Meatball]

I don't think it's the pedal as it looses pressure by the time I start it in the morning it's at the floor.

[Meatball]

It's been suggested to unscrew the fluid cap and tape it on loosley. Ill see how that works out tomorrow.