Blocks fading and reappearing

I am playing Minecraft Bedrock on Windows 10 and when ever I join a friends world and keep breaking blocks, they keep on reappearing and it is getting annoying, especially when I try add blocks they keep on disappearing, this does this offline as well. I have a good graphics card already but what could be the reason why this is happening?? Does anyone have this issue? Also when I try go into my inventory it does not pop up as fast as before it keeps loading even when I pause the game? This has never happened before. Does anyone have this issue?? It is also a bit laggy.