Excel not responding or Freezing

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Good Morning All



I have a problem that might need a solution. I don't know if the issue is on my side or the client.

A client e-mailed me his workbook on a fortnightly basis (for us to fill in his time sheets) as we do his payroll. He is currently on Microsoft Office 2007. Its quiet a large spreadsheet with conditional formatting etc.

We are on office 2013 Professional. Now here is the problem. Sometimes when we work on the spreadsheet whether to find something using find and replace or inserting amounts or forumlae or functions our excel system freezes (sometimes the system goes blank or hangs) and I have to auto recover the sheet again (auto save is on for 1 min intervals), sometimes I loose half the work due to the Excel crashing and it only saves some of the work

Is it my office system or theirs , I have tried it on different office 2013 Pcs and they do exactly the same Both Office 2013 PCs are patched. However I am unaware of the 2007 Office if its patched or not, will it work if I tell the client to upgrade to 2010?

Looking forward to the reply