Tuan Phan Thanh wrote: ↑
Thu Apr 04, 2019 6:03 am
Because before i play a i play e open then when i play a the e string still vibrate it catch the thumb.
As Chris says, this shouldn’t happen. Look at your hand position, in your videos it looks like it might be a little flat and the thumb too close to the hand. Try moving the knuckles further towards the treble strings to bring the fingers a lttle more vertical.
You need to find a position where the thumb clears the string and doesn’t lay back onto it.