Several glitch

I have encountered several glitch on Minecraft Bedrock Nintendo Switch. The first one is when I'm in a boat and I press the A button or the jostick button to exit the boat, the boat disappears. The 2nd glitch is when I me walk on the boat the pieces load badly so I have to wait for it to load and it's the same when I fly with my elytra but then it's normal with the elytra since I go fast. The 3rd glitch sometimes when the parts load badly or when I go too fast the game crashes for a few minutes and sometimes it happens when I fly with my elytra when I'm underwater and when I fight a monster and then I die :/. And the 4th glitch when I delete my texture pack and I use the Minecraft texture pack there are leftovers from my texture pack that I deleted please can you fix this problem.