A common problem with torches and flashlights, especially led types of certain price ranges, especially those constructed of aluminium.
Most such torches use a push switch that has a point contact that soon becomes incapable of providing the perfect contact that is needed for low voltage low current applications. The materials used usually isn't the best for the job.
Aluminium casings are prone to oxidisation which is an electrical insulator.
Whether it can be fixed depends on how far it can be dismantled, the design and how handy you are.
A torch should ideally have a switch with a wiping or self-cleaning action and be hard wired with high quality nickel-plated brass or copper internal components.
It is many decades since such a torch was generally available at reasonable prices so a compromise might be made by spraying the inside of a new torch with a silicone spray or WD-40 and repeating whenever the batteries are replaced.
Not to many places are around anymore that I know of that fix appliances whether it's a flashlight or whatever, unless you know somebody personally that fixes items on the side as a hobby. Maybe sometimes the company of the product offers a repair or replacement. But sometimes the cost of that process out ways the cost of a new one. That's partially the reason most places don't repair.
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