The problem could also come from the battery holder. For new ctrlX CORE the problem is already solved (from middle of June 2021)
Error description: the ctrlX CORE loses the time if the control has been switched off for more than a minute.
Solution: Replace the battery holder with the new battery holder: R911406063 It is recommended to switch off the control before the battery holder is exchanged. The exchange would have to take place within 30s so that the time is not lost.
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