We received several similar reports about Bit Defender causing crashes and forwarded them to the developers of Bit Defender who started to investigate. Perhaps they already have an update of Bit Defender, please check for the latest updates and ask Bit Defender for additional information, they should be able to inform you about the current status of that issue in Bit Defender.
I heard from BitDefender and followed these directions. This worked for me.
Chuck
Please follow the steps below in order to check if it solves the issue you are
dealing with:
1. Open the BitDefender window, select Settings, then select the Expert mode
in Switch UI and click on Apply and then on Ok;
2. Select the Antivirus module and then click on Advanced Settings;
3. Please turn it off by unchecking that option and then click on Ok;
4. Close the BitDefender window and check if the issue still occurs.