nah it doesnt work like that, the buzzer sound is to just let you know you missed a ball. But the mega strikes can be a real pain online, especially when the game starts lagging!
Well i noticed that it happened to me when I was playing my first online game ever. I would be calm during single player mode and rarely miss, maybe once or twice during the megastrike. But online, I was a bit nervous i guess and decided to spam the A button to make sure I get every ball..
And it makes sense. It would be easier if you could hit A repeatedly and just move the cursor. But this way, you have to be careful where you are clicking it.
Then again, it could all be a coincidence. Is this verified? Anyone wanna test it out?