XR1 Nx's gone crazy

Hi.
Has there been some kind of recall or something on the XR1nx's? We have six of them in our rental, and they keep indicating incorrect, sudden and insane deco obligations. This seems to occur always on a repetitive dive. On dives that would normally have forty minutes or so of no deco time left, the things are tellinjg me that I have these crazy deco obligations, like 2 hours forty-eight minutes at ten feet. There's never a 20 or 30 foot hang, always 10.

Every single one of the units is doing this. It seems like they act okay until I incur an actual deco obligation when I'm wearing one, and then after that they're shot. What do you think?

Are you diving Nitrox? Your description would be explained by repetitive Nitrox dives with the 50% default setting on. If that is not the case, we would need detailed profile information to even begin to guess what's going on.

Sometimes nitrox, sometimes air. It's not the 50% default. I'm pretty sure it's a bug in the program. It really causes some pretty serious problems for us, especially with students. Its odd that you guys haven't seen any other similar problems with them, given that every single one of ours crapped out in the exact same way. I do have kinda bad luck though.

I'll start posting detailed profile information from them here. Give it a read every once in a while and see what you guys think. Thanks so much for your help!