'08 XM Display Weirdness

I mentioned this in another thread but didn't want to continue hijacking it. I've had my '08 LE CC LWB for a week now after replacing my '04 Titan. I was dismayed to see that the display for SAT radio hadn't changed since the original model. I also used to have Sirius but at least I got all 14 characters as opposed to the only 8 I get with XM now. But, a few days after delivery, I noticed all of a sudden I was seeing 14 characters on all my XM channels. However, it has not been consistent. It seems to come and go at will which is driving me crazy and making me think I'm seeing things. At this point, I don't know what I'm going to get when I start up the truck. Sometimes it'll show all characters and sometimes only 8 or even less.

If the Nissan Sirius tuner has 14 character capability, then I would think the Nissan XM tuner would also have the same code built in the hardware. So, am I to assume this relates more to XM's signal as it relates to this tuner or is it simply a hardware only problem? In other words, is this something XM can rectify with their signal? That just doesn't make sense to me, though.