laser do not engrave all the design TFT35_laser_V1.0.3

[HerveW]

Hello,
I just added the MKSTFT35 on laser NASUM Machine A5 Pro.

I use TFT35_laser_V1.0.3
Just changed Baud rate :
#baud rate (9600:1; 57600:2; 115200:3; 250000:4)

cfg_baud_rate:3

Control Is OK.
Wen I start carving, it is not always burning and make the form with S0 in stead of S1000 or sometimes stay on S1000 for G0 moves.
on my last try I had pause moment and the complete design is not carved.

I tried with USB and sandisk SD.
This I a stipid test but bigger carving have the same issue.

What can I addapt to have all OK ?
wc.txt
I include the Gcode I used. It is generated with LaserGRBL.

Thanks for yout help.