I don’t have issue with all notification alert but sometimes it delays the notification, such as I get notification after 10 minutes for when I pick up my phone.
By the way I am using Google Pixel 2 with Wyze Cam v2.
What I have notice that there is Android battery optimization feature for latest Android Pie version, so if the Wyze is set as battery optimize on the phone setting, you might get delay notification because Android Pie try to save your phone battery with battery optimization feature.
So I opt out Wyze App from battery optimization and put Wyze notification in priority, then I started getting notification almost right after motion detect.
Also I suggest that clear the cache one time after the Wyze App v2 update.
Hope this helps.