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Multiple VL53L1X with TCA9548

I try to read 10 VL53L1X via 2 TCA9548 on a Due Arduino.
When I put 10 sensors online I seem to have a stabitlity problem.

The TCA9548 is powered by the Due with 3,3 V.
The 10xVL53L1X are powered by Akku 7,4V over a
Pololu Step-Up/Step-Down Voltage Regulator S7V8F5, witch means by 5V.

The two TCA are connected to the Due with Wire1.

In this configuration I am not able to connect to the 10 VL53.
When I put an Oszilloscope between the Due GND and SDA1 all works well.

Do you have any clue what might be wrong and what I can do about it?

Thank you in advance.

Hello, HSchell.

Could you post a diagram or pictures of your setup showing the boards and all of your connections?