When I open my game it stays open for few seconds then it closes ...it happens mostly when I am on a server or on the title menu screen...I tried to find fixes by clearing cache but nothing seems to work....need assistance on this because I can't play Minecraft PE now...My device is POCOPHONE F1 BY XIAOMI: 6 GB RAM : 64 GB ROM VARIENT : RUNNING ANDROID 9 PIE WITH MIUI 10.1
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Does the crash occur if you start the game in aeroplane mode? (Just to rule out an issue with the Xbox live account sign in)

No...it crashes even if it's off
Have you tried a full reinstall of the game?
Backup any data you don't want to lose, then try the following:
Backup your MinecraftWorlds folder (if you want to save your worlds) (Device storage > games > com.mojang > minecraftWorlds)
Uninstall Minecraft
Delete the com.mojang folder (Device storage > games > com.mojang)
Reinstall Minecraft
Run Minecraft and if it works restore your MinecraftWorlds folder
Sometimes a clean install of the game will help with these kind of issues.
You might find the following links helpful:
Quick Links:
π Issue Guidelines β π¬ Community Support β π§ Feedback β π Game Wiki

Thanks...but I even tried that ...got to 1.8...then returned to beta...then again went to official release 1.8 but nothing seems to work
Thank you for your report!
Crashes such as these are logged automatically, and will be looked into further by the development team.
If you need help or support you might like to follow a link below.
Quick Links:
π Issue Guidelines β π¬ Mojang Support β π§ Suggestions β π Minecraft Wiki