problem issue with serato

i am using a toshiba ssd 8gb ram i3 

i always use serato and everything works properly 

i always manage my playlist

i recently saw a transformation speed for the waveform 

the waveform is loading too slow and the music keeps moving <ps.i always analyse my tracks before performing>

one day the waveform stops loading and the music stops

so i tried reinstalling serato and the driver for my hardware and it made the same thing so i tried all the updated  of serato from 1.6 till 1.9 and the problem still goes 

i tried to use external hard drive for my music and reduce the library size and the problem still goes on 

i brought a new laptop lenovo core i7 and i installed serato and the problem is still the same 

can anyone help me please i'm having a serious problem 

i waannaa goo tomorrow to the club and i don;t wanna mess out

thank you in advance