Barring poor water quality....
This is a guess here, but the swaying side to side is probably stress induced because of acclimatization? When I first introduced my shrimp to the tank they did they same thing.
I've had a few shrimp die in my tank as well. I'm thinking that they died because they didn't get enough food. If you keep a clean tank, have few fish and feed small amounts, the shrimps will have nothing to feed on. Introducing new shrimp into a tank that already have shrimp in it may cause bullying and the new shrimp will never get fed. I target feed my shrimp daily to make sure it gets some food.
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