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There could be several reasons why the python scripts become unresponsive when reading data from a Xiaomi Mi sensor via Bluetooth on a Raspberry Pi. Some possible reasons are:

1. Bluetooth connection issues: Sometimes, the Bluetooth connection between the Raspberry Pi and the Xiaomi Mi sensor can be unstable or intermittent. This can cause the python script to become unresponsive when it is waiting for data from the sensor.

2. Slow data transfer rate: Bluetooth data transfer rate is lower than other wireless protocols like Wi-Fi. If the sensor is sending a large amount of data, it can take longer for the Raspberry Pi to receive and process the data, causing the script to become unresponsive.

3. Resource constraints: If the Raspberry Pi is running other resource-intensive applications alongside the python script, it may not have enough processing power or memory to handle the sensor data efficiently. This can cause the script to freeze or become unresponsive.

4. Coding issues: If the python script is not properly coded to handle errors or exceptions that may occur when reading data from the sensor, it can become unresponsive when encountering such issues.

5. Hardware issues: If there is a problem with either the Raspberry Pi or the Xiaomi Mi sensor hardware, it can cause communication errors and make the script unresponsive.