See the Section 23.5.3.1 of the T1042 Reference Manual:
The bus is detected to be busy upon the detection of a START condition, and idle upon the detection of a STOP condition.
It looks like that a STOP condition is not detected.
Send STOP condition again.
Try to use command sequence from the Section 23.6.2.3.
Have a great day,
Pavel Chubakov
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