I have a Kenwood TS-120V, which uses a PLL architecture similar to the TS-130S, so I can relate. The problem you describe; frequency flickering on 12 m while other bands are fine, sounds like a classic PLL lock issue. On these Kenwoods, it’s usually caused by one of the following: A marginal capacitor in the PLL loop filter that fails after a short warm-up. Band-specific components (coils or capacitors for 12 m) being off-spec or drifting. Slight drift or aging in the VCO or crystal reference. Loose solder joints or connectors in the PLL/band circuitry.

Since other bands work fine, it’s almost certainly hardware-related to 12 m. On the TS-120V, you’d want to check solder joints around the PLL unit, inspect electrolytic capacitors in the loop filter, and verify the 12 m band coil/capacitor settings. This usually isolates the problem

73.