Olight M3XS-UT wont stay on

Hi,
I have a relatively new Olight M3XS-UT and have only used it a couple of times. I have only flattened it once, or i thought i had as it stopped working in the highest power mode. I figured that once i recharged the batteries it would come good. It has not.
I have tried new batteris and changing the and power button for the pressure switch. All contacts appear to be clean.
It works in moonbeam and low power, but not for long in medium or high.
Anyone had a similar experience?

Thanks in advance.