This anomaly applies to Revision 1, build codes QFAA-Bx0, CIAA-Bx0, QFAB-Bx0.
The LFRC oscillator does not start and the LFCLKSTARTED event is not triggered.
The LFRC oscillator is started in the window [66 µs, 138 µs] after the LFRC oscillator has stopped.
The LFRC oscillator might become non-functional until it is reset.
Delay starting the LFRC oscillator if it was last stopped [66 µs, 138 µs] ago.