I have been flashing through some of the latest ROMs and here is what I have noticed so far :
[ROM] ll* CFay_RHOD_500/400 *ll ll* CEOS 21887 *ll ll*Build 1.4 *ll COMPLETE OVERHAUL - almost completely unusable because of this error. I ran his original rom the longest and only had minor popups.
|R|6.5.3|ROM|WWE| ★ EnergyROM "Phoenix 2" 28014/21885 ★Dec 17★ Sense 2.1/Titanium ★ - Had less of the popups but took it off due to the mms/txt freezing up issues.
║MightyROM.com║ ║Windows Phone®║ ║Sense UI║ ║01.09.2010║ - knock on wood. No popups and no lockups so far. Been running it for almost 3 days and it should have at least done it a couple times now.
Don't know if this can or will help anyone but just thought I'd share my experiences. My coverage area is under Zip(s) : 62938 & 42001.