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We report on the fast Nova Sgr 2016 N.4 being surprisingly trapped in along-lasting and bright plateau (Delta I >= 10 mag above quiescence) six yearspast the nova eruption. Very few other novae experience a similar occurrence.We carried out an intensive observing campaign collecting daily BVRI photometryand monthly high-resolution optical spectroscopy, and observed the nova inultraviolet and X-rays with Swift satellite at five distinct epochs. Thebolometric luminosity radiated during the plateau is ~4200 Lsun (scaled to thedistance of the Galactic Bulge), corresponding to stable nuclear burning on a0.6 Msun white dwarf. A stable wind is blown off at FWZI~1600 km/s, withepisodic reinforcement of a faster FWZI~3400 km/s mass loss, probably orientedalong the polar directions. The collision of these winds could power theemission detected in X-rays. The burning shell has an outer radius of ~25 Rsunat which the effective temperature is ~7600 K, values similar to those of a F0II/Ib bright giant. The Delta m < 1 mag variability displayed during theplateau is best described as chaotic, with the irregular appearance ofquasi-periodic oscillations with a periodicity of 15-17 days. A limited amountof dust (~3x10^(-11) Msun) continuously condenses at T(dust)~1200 K in theoutflowing wind, radiating L(dust)~52 Lsun.

Persistent nuclear burning in Nova Sgr 2016 N.4 (= V5856 Sgr = ASASSN-16ma) six years past its outburst