Nether portal's result by porting players into walls

At random times when traveling to and from the nether, I will be teleported into blocks of some kind and be stuck in the "Building Terrain" loading screen unable to act while I hear myself dying after I die I do experience the "You Died" screen with my character model a block or two from my nether portals proper position. When I respawn all my items are gone, nowhere to be seen around the nether portal inside or outside the nether. This seems to occur randomly, as at times it does function properly.