App closing

I hope you can help. I am finding that when I open up Idoceo and begin using it the app will run for a few minutes and allow me to make changes as usual and then after a few minutes (the time varies a bit) the app will crash. This is happening every time I use the app now and is obviously driving me potty. I have not got a problem with any other app on my ipad and I have ample available memory.
I have Idoceo 3 and my ipad is also fully updated.

Thanks for your anticipated help!

Sorry - accidentally posted this in the wrong area - can't see how to delete it. Doh!

Hello Katherine,
You should make sure that the gradebook tab you're working with does not have more than
150 columns
Sometimes when importing data with an Excel file, it imports a lot of empty columns that you should erase.
From the gradebook view, tap on Tools(top bar) > Columns and give this list a look
If still can't sort it out, do let me know
Regards