Unstable psychical phenomena can be the result of many factors. One factor can be mental or physical health. Through my years of research I have found direct correlations between psychophysiological health and psychical stability.
When the psychophysiological health of an experient of psychical phenomena is compromised to any degree (e.g. stress, anxiety, acute or chronic pain), the experient is bombarded with an increased reactivity to psychical stimuli.
This increase is typically equivalent to the magnitude of the psychological or physiological factor initiating the increased reactivity (e.g. mild stress = mild increased reactivity). In the case of psychophysiological factors, ideally, experients should address the condition and instability as soon as they emerge.
Whether the condition is the result of the psychical instability, or the psychical instability is the result of the condition is never clear, but treating the condition appears to treat the psychical instability every time.
Another factor can be the result of the experients immediate environment. I have found many correlations between elements in the environment and increased psychical phenomena during my years of research.
While these elements maybe advantageous to those experiencing stable phenomena looking to enhance said phenomena, these elements can also send unstable phenomena spiraling out of control. Elements can include specific wavelengths of light, pigments of color, and various types of materials in the experients immediate environment.
Experients can identify these factors via psychical assessment. Once the experient is aware of what factors to work on, or avoid, the experient can begin their way towards psychical well-being.