Automatic Updates

I have been using Bitdefender since 7 years without any problem. But in recent time i have seen that it updates lesser than earlier . Like earlier it updates almost 6-7 times in a day after 2-3 hours automatically. But now hardly 02 times in a day ...Not only that after boot many time it occurs that it doesn't update automatically i need to manually update....

Is Enabling Stealth Mode & Use passive detection mode can hamper automatic updates ?