With the increasing field strength, one can observe continues lowering of the M R energy, while the S R energy undergoes a noticeable rise, which leads to intended reversal of the S and M forms stability. Importantly, these changes are accompanied with a monotonic decrease of the S → M energy barrier. Eventually, when the barrier drops to the level comparable to thermal energy available to the system, a spontaneous S R → M R → S S transformation is anticipated, realized through the switching-unit rotation followed by a thermal rotor relaxation.