Worst feeling ever while solving?

The U and the top right corner of the L face exploding on me. This always happens with my 7x7. One time I was just about to get a sub 10 minutes on mine and the cube explodes midway while I was doing an A Perm so I'm like, "NO! NO D:" I put the cube back together again and solved the last bit and I ended up getting 15 minutes >_>;
 
Once while solving my V-Cube 7 on camera (which takes me over 20 minutes) after I just got done with the centers and i accidentally hit the space bar...

Then I tried it again a week later, the camera fell over and hit the space bar...
 
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