I also run a voucher site and see similar fluctuations for a number of target keyphrases.
Vouchers and coupons hve become an extremely competitive space to be fighting for ranking with all coupon sites working hard to gain position.
Watch the ranks of your competitors and you'll see most - but not all - fluctuate in the same way. Things were less stable earlier in the year, but lately for the terms I have to focus on, three sites have significant dominance and are pretty solid in the top three slots across the board. Researching the backlinks to those sites reveals some heaviweight, highly releant and high quality links coming into wht are very established sites. That is tough to beat with anything reletively new. Competitive research is the key to understanding hat you can do better to gain position. But of course, once you do, expect your competitiors to fight back to regain theirs!
As has been stated above, keep building those quality backlinks. It's tough to do, but that's why the SE's put so much weight in them.
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