multiple load cell with teensy 3.2

Hello !
I try to find solution for my problem but didnt find at all, not here or in google.
I have 8 load cell, with HX 711 to each one. I connect all of them to teensy 3.2. Vcc to 5V and VDD to 3.3 V. I can read 3 lines from the srial plotter and its work fine, but when I connect 4 or more load cell to the teensy, its start to read and than just stop reading .
I would like to get any help for that.
thx!