I'm having the same issue on a stock rom. It just started a few days ago. Switching it under phone information menu only works for a short time as it switches it back to wdcma preferred. I called CS and they opened a tech ticket. I'm certain this will go unresolved as most calls to CS do. I do have an older SIM so I was thinking of swapping the SIM. My wife has a HTC One M8 and hers doesn't experience the same issue.
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