  Here we investigate light curves of the continuum and emission lines of five
type 1 active galactic nuclei (AGN) from our monitoring campaign, to test
time-evolution of their time delays.Using both modeled and observed AGN light
curves we apply Gaussian-kernel based estimator to capture variation of local
patterns of their time evolving delays. The largest variations of time delays
of all objects occur in the period when continuum or emission lines luminosity
is the highest. However, Gaussian kernel based method shows instability in the
case of NGC 5548, 3C 390.3, E1821+643 and NGC 4051 possible due to numerical
discrepancies between Damped Random Walk (DRW) time scale of light curves and
sliding time windows of the method. The temporal variations of time lags of Arp
102B can correspond to the real nature of the time lag evolution.
