In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

If the oscillator won't go, it may be that the particular configuration is lacking enough power to drive it.

While the oschs1, oschs2, and so on are assigned to particular frequency ranges, they basically are different levels of oscillator drive power.
I suppose you could bump up one level if the oscillator won't go.

Reconsider your hardware.
The problem could be the kind of crystal one is using, the quality of the osillator device, voltage drop due to small or long leads, cold solder joints, not using capacitors on a resonator that requires them, or using an improper resistor  omiting a resistor in parallel.

So, if you have a good 'always working' resonator, set it aside for troubleshooting.

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