VL52L1X with Serial on Arduino Mega

[Serafina]

I use the VL53L1X TOF- Sensor on an Arduino Mega.
With just the Sensors, everything works well.
But when I try to read from Serial1 (and I tried Serial2 and 3 as well) I do not receive any Data from the SerialPort.

Without the Sensors the SerialPorts work well.

I do not undestand, where this comes from. Has anyone some advice for me?

Thanks!!