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That's out of character for Moon, and unacceptable for any consumer durable.
Included in the sale of goods legislation is a section on burden of proof3...
• Where faulty goods are returned within the first six months of purchase, the consumer
has the benefit of a presumption that the goods were faulty when delivered.
3Sale and Supply of Goods to Consumers Regulations 2002TL;DR - take it back to where you bought it, they must refund, repair or replace.
My moon comet just died after less than 6 weeks. A shame as it's a neat and bright little light.