Like humans and most other animals, cats depend on their inner ear canals for balance. A lack of equilibrium can be caused by an ear infection. Any infection, in fact, if it is severe enough, can affect equilibrium. Additionally, a cat uses his tail as an active weight to aid his balance; a disease that affects the control of his tail, or the traumatic loss of a significant part of his tail, can hinder his balance.
a bad harmonic balancer
PMT....everytime
addictions
i had the same problem with my 90 ranger just suddenly cut off and won't start back or would start but ran awful it was the chassis ground broke
My first guess would be fuel pump failure.
it should be either due to lung collapse
Maturity, wanting of breeding, changing of hierarchy.
laying in a corner shaking laying in a corner shaking laying in a corner shaking
A disconnection in your wiring. loose wiring.
Check for a spot of corrosion!
System could have a humidistat installed...
It could be due to many things like humidity in the air or wetness