Hi Melania,
My name is Riley and I'm an Independent Community Adviser. I'm also a regular Microsoft customer like yourself and I'd love to help you with your problem.
Have you tried saving the spreadsheet under a different file name?
Does this happen with all spreadsheets or just that particular one?
Awaiting your reply,
Riley
Independent Community Adviser
Current Time Zone: Greenwich Mean Time
PLEASE NOTE: Please allow me some time to reply as my messages might not come through instantly. Thank you for your patience.