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I noted that the reception interference occurs very predictably and periodically, approximately every 30 seconds.
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That would eliminate both of my previous suggestions but, ironically, my recommendation might be the solution anyway.
Assuming that you're receiving periodic bursts of noise into your problem channel's bandwidth, relocation of the receiving antenna might be the solution. In addition to possibly getting the antenna into a spot where the interference is lessened, it would also likely improve the signal of the desired station thus improving the SNR.
Ideally, what you need is spectrum analyzer to assist in finding the source of the presumed interference. They're not inexpensive, though, and there's always the possibility that the interference is only within that channel's bandwidth and won't be seen anyway.