I have that happen on normal mode which is bad enough. I haven't done hard mode because I don't see the point. After I heard there are no elemental primaries I stopped with the raids all together. If you can beat the raid on hard and the only reward is possibly raising your light level a few more points then why. You just beat the raid on hard without it so its superfluous. I gave up on normal because I ran the whole raid and got some moldering shards to show for it. Kind of takes from the excitement when you're the equivalent of Charlie Brown getting a rock for Halloween.