[n2o302]

Like the title says for some reason every video or pic I take on my evo it stays on there for a day or two and then when I go to look at them in my gallery after a day has passed all I have is a grey box that keeps showing error. Does anybody have any ideas of to what is my phone doing? It is just a stock rom EVO, a few apps, a task killer and I started with a 16gb sd card and now it has a 32gb card in it, could it be a bad sd card or is there some box that I have unchecked that keeps deleting my pics and videos? I did the research online and the close answer I have from another forum is that my 32gb card is to big, I did search on here but have just come up with nothing.

Thanks in advance!