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Of course for gems to drop you have to be killing enemies and some waves feature few but very resilient enemies. These waves yield much less experience than waves with many but weak enemies unless you have a really strong build already.
While you are playing the game, every monster you kill will (has a chance) to drop an experience gem. Once you get to a certain number of XP gems lying on the ground (500 is the number I heard), the game will generate a special Red Gem that all following XP gems will collect in.
So, no more gems will drop and the value of the gems, that would have dropped, get added to that special gem. (Note: The gem will usually spawn in one of the corners of the screen)
When you walk over that particular Red Gem, you gain all of the experience stored in it, in one go. That is why you get an 'explosion' of level ups.
I believe this is what causes those "explosions", which would be why it didn't happen much when you were stationary, you weren't leaving a bunch of gems behind across the map.