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iPad app: Live data graph lines disappear suddenly #950

Description

@microbit-grace

Occurred on v1.5.1-apps.

Reported by Paul.

In a number of cases, the live data graph stopped displaying the lines as expected. The micro:bit was still connected, and receiving data. You could see the x, y, z moving on the right. We also tried recording data, this worked (graph lines in the data samples were visible, just not in the live graph).

The issue seemed to just be with the lines not displaying.

This happened on at least 2 x ipads at the session in the school. They were not running other software. Children were using record 10s of data, but the issue was also happening after training the model and testing it.

In a recorded video of the issue, the user was recording 10s of data when it happened whilst recording 9 of 10. Disconnecting and reconnecting did not fix the issue.

Devices:

  • iPad Pro, software version is 15.4.1
  • Also on iPad Air 2, v 15.8.8

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