So...my new 360.

[Angrist]

Originally Posted by Dark Samurai

Or, I could have misundertood your statement and it could be your controller lol.

This.
I know about holding the A button to keep hitting. That's not what I mean.

This concerns all buttons. Let's say I play as Ike and I'm charging my side-B attack. I can't. Because the B will somehow be released early. And pressed again. And released. All within seconds.
Or my shield. I'll go in and out of shield when I really keep pressing the button. Very annoying.
It works out of combat too, like in menus with the d-pad, or selecting a character with the A button.

Only happens with 1 controller, only sometimes. When I google the internet, I only get answers like yours... seems my problem is unique.
I'll contact Nintendo if it stays this way. I'll keep an eye on it. I thought it might be the batteries.