Data problem on pure nexus.

I am running pure nexus 9/17 build and am having issues with cell data connection. It works great when connected to 4g, but cannot connect to 3g or 1x, When it trys to switch to either I get a notification to sign into the network, it will continue to do that until I get 4g signal back. It has done this on both builds I have tried and hear it occurs on other custom roms. My carrier is US Cellular and I think the issue is only with them.

For what it's worth... Out of the box there is a bug with the nexus 6 on uscc, it effects stock roms and the custom ones i have tried. The carrier label says "roaming indicator off" instead of "US Cellular", there is an eri file out there that fixes that though.

So the questions are...
Does anybody have any recommendations how to fix the 3g issue?

And what are the chances both issues are related?

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