Microcontroller stops comunicating serially after motor connection

Hello,

I'm currently working with an arduino UNO which uses an Atmega328P, I'm trying to control the movement of three motors with two accelerometers and communicate with a computer serially to know inclinometers' position. I'm using the L298N driver to move the motors with the microcontroller, I use PWM for the control signal and a digital pin for direction signal for each motor. I use separete power supplies one for the microcontroller, one for the two L298N, since each chip has two full bridge drivers, and one 24V power supply for the three motors.

The problem is that the microcontroller can move one motor almost without any problems, but when I move a second motor serial comunication disconnects, even sometimes this disconnection occurs with only one motor moving, sometimes disconnects as soon as the motors start running and soometimes it disconnects after a little while.

As I said before, I use separate power supplies and for test porpuses i've left the accelerometers out, so I'm currently only testing the motors with the serial communication. I've read the drivers datasheet and it says that the drivers only need an input current of 100 uA at most for the control input signal and the direction input, Arduino's pins can source up to 40 mA. Also I've meassured the current through the motors and they sink no more than 400mA each, and the driver L298N can take output current peaks of up to 3 A and repetitive output current of up to 2 A each channel.

I don't know how to get my circuit to work, any ideas?

I attached the specifications table from the L298N datasheet

Best regards,
Angel