This issue is related to Vanilla Minecraft PE. Upon loading the Minecraft app, I attempt to enter a multiplayer LAN hosted by a friend. We are both connected to the same WiFi. As she is the host, I attempt to enter the world she has created/hosting. The app reads "Connecting to Multiplayer.." and then eventual gives the error "Unable to Connect to Multiplayer". To resolve this, the following attempts have been made to correct the error and some have been successful while others have not:

-Signing out and Re-Signing in of my Microsoft account.
-Closing the App, then reopening, and resigning back into my Microsoft Account after signing out before closing the app.
-Restarting my device and repeating the steps above.
-My friend closing out of the world, re-starting and I attempt to rejoin after she has restarted.

Following this, should the attempt be successful for me to join, we are able to continue. However, today alone, I have been kicked out of her LAN and "Disconnected from the Server" several times. I attempt to rejoin but I again either have to resign into my Microsoft Account, close/reopen the application and attempt the same "Troubleshooting" errors to join our Multiplayer LAN.

All the while, my personalized character is not saved and I have recreate him after resigning back into my Microsoft Account. Though at times the character is "Saved" it seems to be deleted/lost into the fray of attempting to join the Multiplayer World previously mentioned.