Maximum number of TextComponents/GameObjects

I'm making a simple 2D sudoku game as practice, and have a different TextComponent for each note within each cell. But after rendering the first two thirds of the TextComponents correctly, I find unity stops rendering the text values.

There is 9*9 cells, each with a canvas, containing 10 GameObjects with TextComponents, so over 810 GameObjects. Unity is rendering around two thirds of them, and the rest just don't respond to their text values.

Here is a screenshot of the app, running from unity, as it silently fails.

I should be able to get around this by merging the small text components into one component per cell, but what is the correct approach when a 1000 or so TextComponents have to be rendered? It doesn't seem a huge number.

Thanks,