Networking and its auto-pilot.
I've been having jumpy connection/download speeds for awhile and noticed its the same problem i've always had with bitdefender after awhile. I uninstalled bitdefender to see if it wasnt just my internet (Note: this has been going on for the past 3 days) and the speeds wen't to its normal and been staying there for a few hours.
Also, not sure if its a problem, but everytime i switched to manual mode from auto-pilot it just keeps switching back to auto-pilot. So dont know if its the gui or something.
I'm aware of Bitdefender having a really bugged GUI. I had a lot of members on other forums come to me with problems about settings not moving or being reset to their defaults on restart. I'm also aware of connection speed issues when using a Bitdefender product. Did you have Gaming Mode enabled ?