  Utilizing a decade-long unTimely dataset, supplemented by multi-band data
from archives, we search for young stellar objects (YSOs) with variations
larger than one magnitude in W1 band within a region of 110 square degrees in
the Galactic plane, covered by VISTA Variables in the Via Lactea (VVV). A total
of 641 candidate YSOs have been identified. We classified them into bursts,
dips, faders, seculars, and irregulars. Within the burst category, 18 sources
were identified as FUor candidates and 1 as an EXor candidate. Irregulars are
the most prevalent in the sample. In both bursts and faders, the redder sources
tend to show a pattern of bluer when brighter, whereas the bluer sources
display the opposite trend, possibly related to the accretion structure of YSOs
at different stages. Finally, we obtained the recurrence time scale for FUor
eruptions at various stages of YSO evolution. Our findings indicate that
younger YSOs generally experience more frequent eruptions compared to older
ones.
