Erica. I put up the same questions to the Apple Safari forum and got a couple of very interesting answers. Apparently the problem is caused by Sophos itself and uninstalling it should sove the problem. This has worked for me but it's early days yet. Please see below Eratic access to Safari and Firefox The anti virus software is the culprit. Follow the instructions for uninstalling Sohphos > How to remove Sophos Anti-Virus for Mac Gatekeeper is pre installed on your Mac to prevent malware. Open System Preferences > Security & Privacy then select the General tab. Make sure Mac App Store and identified developers is selected. If that area is grayed out, click the padlock icon to proceed. OS X: About Gatekeeper Anything else is overkill on a Mac.
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