A long shot but is your Glo in a cover ? I had a problem with a Glo switching off at random which I traced to it being in a third party sleep cover. What was happening was that when the Glo was snapped into the cover it exerted pressure at the top, near the power button and any slight flexing while in use would trigger the Glo to switch off.
IIRC the problem went away after I opened the Glo up and used a puffer to get rid of any dust, etc near the power switch, carefully re-closed the unit and then used a different cover that didn't use a snap-in approach.
BobC
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