p20 lite apps crashing

[labas]

hey I bough phone new, now when I reiceived messenger and close from notification center it shows stil, when I open messenger still heard messenger sound and sms shows even when I swiped right or left. when I'm go messenger I hear messenger sound , on s5 neo, a5 2016 no problem, but in huavei p20 problem, I swiped left to close, after 5sec it still shows messenger in notification bar, or even when I go to messenger and shows messenger updates and heard sound, still shows previously messenger who wrote me even when I closed up notification and don't read that after 5sec still shows in notification bar , or even when I opened messenger app I got the same messages still sending now, but I got before 10minutes, on the top I see who wrote me, and what even when I swiped left to close from notification center. what is this??? 

[labas]

I buy new phone , and now I play video from gallery , got black screen and lag, I see huavei video stopped, why? New phone

[boey]

50 minutes ago, labas said:

I buy new phone , and now I play video from gallery , got black screen and lag, I see huavei video stopped, why? New phone

claim warranty from whoever you bought it from and get it repaired/replaced