brand new Teensy 4 and propshield soldered together (which was a mistake cos now they are almost impossible to separate)

CalibrateSensors installs and runs. Works until I start wiggling the device. Then after a few seconds it hangs. The LED stops blinking and the serial output stops

The MotionCal application shows the begining of a red sphere but it also hangs once the wiggling starts (because the serial output from the board stops I guess)

Im on Ubuntu 19 and had to manually install libpng12.so.0

If I dont wiggle the board then it keeps working indefinately

Is this hardware or is the software a bit flaky?