Thunderbolt drops 4G off and on

My Tbolt won't stay in 4G mode.  It will do fine for a few days, and then drop to 3G, or sometimes 1x, and occasionally, nothing.  I'm right in the middle of OKC where there is great 4G coverage.  My wife also has a TBolt, and hers is locked solid to 4G at 20Mbps, while mine won't even acknowledge 4G's existence.  Same thing when comparing it to 2 other people at work with Tbolts.  After an undetermined amount of time, I'll look at it, and its back to 4g.
I have LTEOnOff, and I've tried toggling between CDMA only/LTE mode/CDMA +LTE/EvDoAuto, but it doesn't help.  I've tried toggling in and out of Airplane mode - no help.
When I started typing this, it was in 3g.  Now it's showing nothing. 
Verizon's attempted explanation is that I'm probably on the edge of 4g/3g, but I can't accept that when other's phones don't have this problem right next to mine.
Are there any solutions, other than to get my phone warrantied out?
Now it's on 1x.  :<  My wife's is on 4g.

"If I attempt to use a 3rd party app to turn off 4G altogether, I then cannot get SMS messages but turning off 4G altogether defeats the purpose of purchasing this phone int he first place."
I wanted to say that you can, or should be able to turn off 4G without using a third party app by going to Settings/Wireless & networks/Mobile networks/Network mode and clicking on CDMA only which will only use 3G and not jump from 4G to 3G.
"This is a serious issue and needs to have a knowledgable team to address this specific issue.  Any VERIZON REPS READING THIS??  Let's get this fixed!!"
I also agree with your last comment and if you refer to the link in my first post, a Verizon rep did respond and as far as I  know, no one has heard for the rep since. I very seldom see a rep respond with a solution after their first one or two posts.
http://community.vzw.com/t5/ThunderBolt-by-HTC/Reduced-Radio-and-4G-Data-Reception-Post-Update/td-p/596524
If I continue to have problems with it, I'll try another Factory Reset, but I really don't think that's going to help to fix the problem any more than it did the last time HTC had me do one because they didn't have any other suggestion for fixing my problem.
Your best bet may be to just keep calling Verizon tech support and bugging them until they actually do something. One of the first things they will probably tell you is to uninstal the third party switching app. I've already done that an it doesn't work, so I'm still using one to force it into 4G. You might also use the same tactic by going to your Verizon store repeatedly and complaining, just because I tend to get more help and better responses from the reps in the stores and they will sometimes do things that the phone customer support reps won't, or say they can't. At least that's been my experience, but maybe I just have good store reps. They tend to try harder to make me happy.

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