So i looked around and couldn't find any way to fix this issue. I have been trying to stay up to date on the WiFi reconnecting every 5 minutes, but this isn't the issue I'm having. Whenever I open Microsoft Excel 2011 on my Macbook Air running Yosemite, it crashes after a few seconds and asks me to send the report and if i want to open the saved data, which puts me back into a loop of reopening, then it crashing and so on and so on. Does anyone have an idea on how to fix this? I have never had so many issues with an operating system before. Please help.