Ive played  Minecraft PE since it's initial release and have never seen this issue It just started up a few weeks ago for me, but after about 30 seconds of being in a world or server, the graphics begin to detexture, flash, and skew and stretch. It looks like it is as if the whole world is dematerializing if that makes any sense at all. Ill attach a few pictures to help make sense of what im saying. It starts out over the horizon, and i can watch it quickly consume the world and make the game nearly unplayable. Please if someone could help me with this issue. I play PE on a samsung 21+ 5G. Ive played minecraft on this phone for nearly a year so i know it isnt the phone, or at least i doubt it is.