My world dissapears

I open minecraft to be on my world that has real Monopoly, and this is the 3rd time this has happened, but Whenever I have a world with a lot of command blocks the world just disapears,but is working Tuesday, and gone Wednesday, I did not delete that world, I am POSITIVE, but this is also the 3rd time, the other two had a lot of command blocks, I asked my parents, I checked some stuff out, but the weirdest thing is that it is still in the saves folder!?!, I have taken it out and put it back in, doesn't work, I thought 1.8.5,6, or 7 would have fixed it, but pls fix this before 1.9 pls.
This started in Minecraft 1.8.4 in a world called Realms: Non Mods (this was a single player world, not realms) I had 3 non mods on there, (I didn't know how to dounload mods, so I used command block) they were Lucky blocks No Ores and Ender Game The lucky blocks had roughly 40-60 command blocks. The No Ores had roughly 10 command blocks. And the Enders game had around 4 command blocks. Nearly 80 command blocks, the last time I was on that world was when I was playing with snowmen,Dragon,Wither,and Golem spawn eggs, I put the spawn eggs is the mob spawner where they started appearing , I turned the mob destruction thing off, and the next day, the world was gone, but in the saves folder
The next world was called Realms Redstone, it had probably 100- 150 command blocks, same thing happened, and finally today, my world called Realms Games was taken out , not by deletion, but even weirder was there was practicly 3 command blocks in the whole thing, my only idea was that before, like 3 days ago, I tested out the command /summon Sheep ~ ~10 ~{NoAI:1} of course I also did that with a pig, I was planning to us them as game prices, but I decided to test armor stands, with arms, and invisible, I think in the 8.7 update, they removed that ability, but I didn't know, so I tried that out, but the world is gone!!!, pls fix asap, maybe in 1.8.8
Thank you for reading, if you have finished yet 🙂 (I have not deleted any of those world's, those were the best worlds I have ever had, PLS GET THEM BACK) I am a serious redstoner, I may as well just quit, otherwise pls fix.:'(

Try putting 100 command blocks and have commands in them, all going on in a Redstone clock