So I have this tuner in my car

And basically what my problem is that sometimes, I get no sound?
I'm not sure how to describe it, but I'll try the best I can. Basically, the HD radio icon is on, so I'm assuming its not a power issue since it shows up while the XM/Sirius Icons are still grayed out.
And I'm not sure if its an antenna issue, but it's like its not receiving any reception? It doesn't display the station name, or song artist/title. Everything is just blank.
I also cannot seek, or change presets.
The HD tuner was working fine every since I installed it at the same time I installed my F90. This issue just happened yesterday where it seems like it just lost reception?
I wanted to verify what the problem is before I tore up my interior again looking for it.
Improper grounding? Antenna jack loose? IP-Bus cable faulty?
help??