Loss of Inventery Items, and Random Spawn

I like to play my survivals at hard difficulty and never turn on cheats. I also tend to stray a long way from the world spawn. Before, that really was not a problem. Now it is. Whenever I reload my Minecraft world, expecting to continue where I have left off, I find my self at the world spawn with not items or armor on my avatar at all. I have a feeling this has something to do with LAN. The occurrence usually happens after I have exited a LAN game and am returning back to the worlds stored on my PC. Thank you for taking your time reading this.