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Just to be 100% clear, dont just hold it in, push it in put pressure on the side of it. Its hard to explain but, push it in and put diagonal force into it. The antenna contact points are on the side...

Sounds like a classic case of loose connection. Is the ST1 sitting on a base or does the antenna plug directly in?

If it plugs directly in, try wedging something around the outside of the plug to...