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We present a detailed study of V899 Mon (a new member in the FUors/EXorsfamily of young low-mass stars undergoing outburst), based on our long-termmonitoring of the source starting from November 2009 to April 2015. Our opticaland near-infrared photometric and spectroscopic monitoring recorded the sourcetransitioning from its first outburst to a short duration quiescence phase ($<$1 year), and then returning to a second outburst. We report here the evolutionof the outflows from inner region of the disk as the accretion rate evolved invarious epochs. Our high resolution (R$\sim$37000) optical spectrum couldresolve interesting clumpy structures in the outflow traced by various lines.Change in far-infrared flux was also detected between two outburst epochs.Based on our observations we constrained various stellar and envelopeparameters of V899 Mon, as well as the kinematics of its accretion and outflow.The photometric and spectroscopic properties of this source fall betweenclassical FUors and EXors. Our investigation of V899 Mon hints instabilityassociated with magnetospheric accretion to be the physical cause of suddenshort duration pause of outburst in 2011. It is also a good candidate toexplain similar short duration pauses in outburst of some other FUors/EXorssources.

V899 Mon: An Outbursting Protostar With Peculiar Light Curve And Its Transition Phases