Frames didn't arrive within 5000 - 30 m distance with 2 active cables

I have been making depth and infrared measurements for some months in a row using the D435, covering a distance between the target and the computer of 31 meters. To do this, I used, sequentially:

- 1 USB-C (M) - USB 3 (M) cable of less than 1 meter 
- 1 USB 3 (F) - USB 3 (M) active cable of 15 meter with connection to a power source, and
- 1 USB 3 (F) - USB 3 (M) active cable of 15 meter with connection to a power source

The cable is provided by Aten (https://www.newnex.com/usb-3-active-cable-a-to-a-female.php) and up to 3 cables of this type can be connected to each other.

However, recently the system stopped working, with the error message: 'Frames didn't arrived within 5000' regularly showing up. Changing the sequential order of the cables didn't solve the issue.

Nevertheless, the live stream in the RealSense Viewer program does work when using this configuration. Also data transfer using e.g. a USB 3-stick is no problem.

I tested the system using only one USB extender cable (testing both cables), and the error didn't appear when running my Python (v 2.7) script in both cases. 

Weirdly, the system using both cables is now recording again and I don't know why as I didn't change anything to the original configuration. 

Does anyone have an idea what might (have) be(en) the issue?

Here is the first part of my code:

import pyrealsense2 as rs
import numpy as np
from numpy import newaxis
import cv2
import logging
import keyboard
import matplotlib.pyplot as plt
from datetime import datetime

# identify different devices
ctx = rs.context()
devices = ctx.query_devices()
print(devices[0])

# Configure depth and color streams...
pipeline_1 = rs.pipeline()
config_1 = rs.config()
config_1.enable_device('832112072362')
config_1.enable_stream(rs.stream.depth, 640, 480, rs.format.z16, 30)
config_1.enable_stream(rs.stream.infrared, 1, 640, 480, rs.format.y8, 30)

# Start streaming 
pipeline_1_profile = pipeline_1.start(config_1)
set_laser = 160
device = pipeline_1_profile.get_device()
depth_sensor = device.query_sensors()[0]
depth_sensor.set_option(rs.option.laser_power,set_laser)