Unsaving items and actions

The new update to Minecraft PE is very cool, but is jam packed with bugs and glitches. The first glitch I encountered relates to logging out and in. I had created sandstone walls around my house, I logged out to take a break, when I returned however the blocks were gone without a trace. Another bug has to do with destroying items and moving items. I had a room full of diamond and gold. When I got gold, and logged out to search up help for the game, i came back on to see that my gold was back to where it was. The same happened when i destroyed a diamond block. On the same map, I finished a Nether Reactor and activated it. After collecting everything, turning Netherrack into bricks and Nether Quartz into blocks, I went to sleep (IRL). The next day (about half an hour ago) I went back on to see my unfinished reactor back next to my house, unfinsihed, and the fortress of Netherrack gone. These bugs are quite iratating and it would be nice if you fixed them. BEST WISHES (-: