[Q] Phone switching from 3G to 4G back and forth constantly topic

Hi folks,
Short version:
My rooted HTC One Max running ViperMax switches from 3G to 4G every 30 seconds or so even not touching the phone. Video of it here:
https://www.youtube.com/watch?v=JLoT3DT-B3Y

Long version with extensive history on the AndroidForums:

http://androidforums.com/threads/roo...sprint.899595/

Thanks in advance!

Crodley