  In the present work we use the Li\'enard-Wiechert potential to show that very
violent fluctuations are experienced by an electromagnetic charged extended
particle when it is perturbed from its rest state. The feedback interaction of
Coulombian and radiative fields among the different charged parts of the
particle makes uniform motion unstable. As a consequence, we show that
radiative fields and radiation reaction produce both dissipative and
antidamping effects, leading to self-oscillations. Finally, we derive a series
expansion of the self-potential, which in addition to rest and kinetic energy,
gives rise to a new contribution that shares features with the quantum
potential. The novelty of this potential is that it produces a symmetry
breaking of the Lorentz group, triggering the oscillatory motion of the
electrodynamic body. We propose that this contribution to self-energy might
serve as a bridge between classical electromagnetism and quantum mechanics.
