I don't know if streaks really play a part in poker. Unless u mean u are constantly getting bad beat with opponent drawing nutz with extremely low odds. But what i know is sng are really about patience, a lot of reading and knowing the moves of your opponent and holding on so if you are losing a couple of sngs altogether, i suggest you try playing 1 by 1 and do a lot of reading on all the players.
Personally i like to write down what players do on a paper in my sng and read on them. For e.g. player A raise pre, or check pre with good hand or marginal hand. It has been effective for me =).
My 2 cents!
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