This is the second time I see this type of event. First it looks like a moving star. After A few seconds of observing the moving light (normal star shine) it increases its brightness by 3- 5 times (brighter then the north star by 3-5 times). It looks like the object is boosting their speed and then vanish after a while because the light gets dimmer and dimmer until it vanishes from sight. The sky was very clear, no clouds.I don't know of any natural causes for this type of event but if you know what may cause this please let me know? I would really like to know.Unfortunately I did not have my phone with me to record any video of it again . It seems like it knows when to show it self :))