I realize this is an old post now but my remote lost all memory I had programed into it a couple of months ago. All default memory was there but nothing I had programed including keys I had used the learn function on and ones I copied from other locations. I had a very custom program and really hate to lose the info.
I first checked the batteries and they were good.
I love the remotes as I have two but there is some problem that causes them to lose memory if we could just find out what caused it. I bet we all did the same thing to cause it.