You don't say why the sheet "doesn't always last" but re-using a 24-label sheet, singly, is maybe asking a lot.
If it's getting scrunched up, your software /may/ allow you to 'rotate' the sheet through 180 degrees, so that you can feed the unused end into the printer first. It will then print the label(s) 'upside down' so that they come out the right way up - if you see what I mean..!
If you're using a laser printer, you might be able to select 'economy mode' or similar. This notioceably reduces toner 'splatter' onto unused labels.
We use 16-label sheets for single-print labels but, to be honest, we usually scrap it after 12 or so. HTH.