No but like all other surface mounted parts... They will fall off if you bake/heat for too long
Seriously: I've heard of people removing electolitic caps and other components before reflow.... But it is a big hassle... honestly, you are taking a risk just by reflowing but if its not under warranty and isn't working then you are not taking too big a risk.
Unless of course you want to sell it to me
... I don't buy cards other people have tried a reflow on... Seen too many people over do it, can cause cards that are unsafe to put into any computer(shorts all over the card and in the power circuit).
Good luck though, I probably won't get to my reflows untill after thanks giving.