Board Thread:General Discussion/@comment-203.81.206.158-20150126083425/@comment-26044650-20150126223239

While it's a good idea to take a break and do something else if you have a bad streak with upgrading your treasures, it doesn't actually increase the odds of upgrading successfully.

RNG is RNG. It is just completely random. There is no way to increase the odds of successfully upgrading your treasures other than spending crystals.