M2 Not Charging when Battery is Low

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I recently took delivery of my M2 and am generally very pleased with it. However, I'm encountering a problem when the battery charge is low. It doesn't seem to take charge when I plug it in. It recognises that a charger is connected, as in tries to go into night mode and stops showing the "Connect your charger" message, but it doesn't actually CHARGE - no notification icon or light, battery keeps draining. Ultimately, the battery goes dead and the phone shuts down.Then, as "expected", it takes a few moments to show that it is charging, and eventually the light comes on and charge happens. This seems to only happen when the charge is low before I plug it in. If there is more than minimal charge, then it charges OK. It's a bit of a problem that I can't charge the phone when the charge is low..... Any ideas?

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