It is highly unlikely that it's FM interference as it only effects VHF. Any co or adjacent channel problems would not come and go. If you bypassed the distribution amp and tried a known good coax from the antenna via a matching transformer, the matching transformer is the most likely culprit. I have found that when using standard crimp connectors, even with a boot, that the boot can hold water and waste the connector. I would go up the tower with a new matching transformer, a snap and seal connector and tools, replace both and your problem should go away.
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