excel unexpectedly closed

Hi,

on one of our Macbook Air microsoft excel is crushing (several times every day). Also autosave sometimes not work. I tried reinstall Yosemite (10.10.3) and disk and permission check. Any suggestion what to do next?

A fragment of console log:

6.7.2015 11:03:38,309 Microsoft Excel[2922]: CGSGetDisplayBaseAddress: Invalid display 0x04248c65

6.7.2015 11:03:57,897 Microsoft Excel[2922]: Unknown class 'SxLabelFilterController', using 'NSObject' instead. Encountered in Interface Builder file at path /Applications/Microsoft Office 2011/Microsoft Excel.app/Contents/Resources/en.lproj/Filter.nib.

6.7.2015 11:07:51,141 Microsoft Excel[2922]: Unknown class 'SxLabelFilterController', using 'NSObject' instead. Encountered in Interface Builder file at path /Applications/Microsoft Office 2011/Microsoft Excel.app/Contents/Resources/en.lproj/Filter.nib.

6.7.2015 11:07:53,646 Microsoft Excel[2922]: Unknown class 'SxLabelFilterController', using 'NSObject' instead. Encountered in Interface Builder file at path /Applications/Microsoft Office 2011/Microsoft Excel.app/Contents/Resources/en.lproj/Filter.nib.

6.7.2015 11:08:29,406 Microsoft Excel[2922]: Cannot find function pointer ExcelPrintPDEPluginFactory for factory A51FBA8C-FBAF-11D4-A260-0030656AD6FE in CFBundle/CFPlugIn 0x88a0f4a0 </Applications/Microsoft Office 2011/Microsoft Excel.app/Contents/PlugIns/ExcelPrintPDE.plugin> (bundle, loaded)

6.7.2015 11:08:54,268 Microsoft Excel[2922]: Cannot find function pointer ExcelPrintPDEPluginFactory for factory A51FBA8C-FBAF-11D4-A260-0030656AD6FE in CFBundle/CFPlugIn 0x88a0f4a0 </Applications/Microsoft Office 2011/Microsoft Excel.app/Contents/PlugIns/ExcelPrintPDE.plugin> (bundle, loaded)

6.7.2015 11:09:24,752 Microsoft Excel[2922]: Cannot find function pointer ExcelPrintPDEPluginFactory for factory A51FBA8C-FBAF-11D4-A260-0030656AD6FE in CFBundle/CFPlugIn 0x88a0f4a0 </Applications/Microsoft Office 2011/Microsoft Excel.app/Contents/PlugIns/ExcelPrintPDE.plugin> (bundle, loaded)

6.7.2015 11:09:28,000 kernel[0]: process Image Capture Ex[2937] caught causing excessive wakeups. Observed wakeups rate (per sec): 909; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 83524

6.7.2015 11:09:28,324 ReportCrash[3995]: Invoking spindump for pid=2937 wakeups_rate=909 duration=50 because of excessive wakeups

6.7.2015 11:10:16,110 WindowServer[114]: disable_update_timeout: UI updates were forcibly disabled by application "Microsoft Excel" for over 1.00 seconds. Server has re-enabled them.

6.7.2015 11:10:23,545 WindowServer[114]: common_reenable_update: UI updates were finally reenabled by application "Microsoft Excel" after 8.43 seconds (server forcibly re-enabled them after 1.00 seconds)

6.7.2015 11:10:25,722 com.apple.xpc.launchd[1]: (com.microsoft.Excel.20196[2922]) Service exited due to signal: Killed: 9