No notifications after root

Hi! I'm new in this forum and with an android device. So maybe it's just me, but i'm really concerned because many notifications don't arrive. Before unlock de bootloader and root the device it worked better but not perfect. But now... I used the app "Push Notifications Fixer" with root permissions, but hasn't improved the situation.

Does anyone have any idea or what can I do?

And one more thing, less important: is it possible to see all whatsapp messages on the lock screen instead of having only one indicating the number of messages you have ?

Thanks a lot! And sorry for my English.