Great app, but ... 3.5 stars because of one issue

Im addicted to this app and its well designed except one one flaw: Often, but not always, the numbers that I have already solved disappear when I resume the game. The time is ticking away at whatever time it was when I paused it but the puzzle is totally blank again and I have to start over. It happens often enough that Im considering deleting it in frustration, although I have enjoyed the game for so many puzzles that Ive definitely gotten my moneys worth. Fix this, and its worth 5 stars for sudoku fans. Thank you.

Oklahoma Music Fan about Sudoku Magic - The Puzzle Game, v2.3