Had a live chat yesterday and Iulia from tech suggested this:
11:11 Iulia Burlacu: In case the problem reappears at some point, I will kindly recommend you not to uninstall BullGuard but to perform the following test:
11:11 Iulia Burlacu: 1) Please open the installed BullGuard application by double clicking it's icon on your desktop or from the taskbar, near the Windows clock.
2) From the initial BullGuard welcome window, please click the "Settings" button.
3) Please click the "Real Time Antivirus" from the left side, then select to turn it OFF and click on the "Save" button. Check if the issue still persists.
4) If it does, please re-enable the Antivirus protection and then click the "Firewall" entry from the left side.
5) Please select to turn OFF your firewall protection and click on the "Save" button. Check if the issue persists. If it does, please re-enable the Firewall module.
6) Click the Spamfilter entry from the left side, select to turn it OFF and click on the "Save" button. If the issue persists, please re-enable it.
This cludge worked until the customer rebooted last night and I now have very angry customer on the phone again...