Negative differential resistance state in the free-flux-flow regime of driven vortices in a single crystal of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>2</mml:mn><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>NbS</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Time series measurements [G. Shaw et al., Phys. Rev. B 85, 174517 (2012); B. Bag Sci. Rep. 7, 5531 (2017)] in $2H\text{\ensuremath{-}}{\mathrm{NbS}}_{2}$ crystal had unraveled a drive-induced transition wherein the critical current $({I}_{c})$ changes from low to high ${I}_{c}$ jammed vortex state, via negative differential resistance (NDR) transition. Here, using multiple current-voltage $(I\text{\ensuremath{-}}V)$ measurement cycles, we explore statistical nature of observing NDR (or quasi-NDR reversing $I$ measurements) free-flux-flow (FF) regime single $2H\text{\ensuremath{-}}{\mathrm{NbS}}_{2}$. Prior occurrence transition, pristine full $I\text{\ensuremath{-}}V$ curve exhibits featureless smooth depinning state. With subsequent cycling, appears curve. Post-NDR, is seen be noisy with commencing higher The probability always remains finite for state created either fast or slow rate magnetic field, $\stackrel{\ifmmode \dot{}\else \.{}\fi{}}{B}$. FF found systematically increase field $(B)$ weak collective pinning regime. In strong regime, said becomes independent. Retaining nonzero under all conditions, observed new data shows that branch more stable compared lower branch. We show generated unique and cannot accessed any conventional route, particular, by preparing static different thermomagnetic history. While curves do not distinguish between zero cooled (ZFC) (FC) modes an has $B$ dependences matter prepared ZFC FC modes. find occurs dissipation where flow resistivity well above theoretical value expected understand our results on basis rapid drop viscosity at drives $2H\text{\ensuremath{-}}{\mathrm{NbS}}_{2}$, which triggers velocity reorganization moving leading dynamical unstable flow. This instability leads into entropy ${I}_{c}$.