My guess is that there is some connection that has worked loose in the body of the radio; and I doubt that you can crack the case open. If this was my radio, I’d contact the SW store, or, if you have the literature that came with it, there may be a factory service center listed.
The Shortwave Store is just a web site that sells short wave radios, and I purchased this one several years ago. Whatever warranty that might have come with it is long gone.
The only thing that came with it is a little booklet in English, French, Dutch, and German that tells how to operate it. So far as I know there aren't any service centers.
Thanks anyway. I appreciate it that fellow FReepers are willing to help me.