How to freeze & reheat quiche
I would use a pizza stone (preferred) or preheated baking sheet underneath the quiche, similar to the method sometimes used to make the bottom of pie crusts crisper. Put the stone or baking sheet in the cold oven and preheat the oven for at least 30 minutes before adding the quiche. This probably won't completely solve your problem, though. Unless the quiche is whole, I'm sure you'll still have weeping/leaking.