The longer I use my Braun light, I'm less happy with it. I've got the switch issue too. Now its almost a strobe, flickering all the time. I bought a Chinese Astro clone off off ebay for $12 and its been superior. Its got the rotary switch to turn the light on and turn up the brightness. The only drawback is that you can't remove the battery and switch them out like the Braun model. Other than that, its a better mousetrap for me.
I've got 3 brauns, 2 used daily in my auto shop for about 11 months, 3rd as spare but no issues yet, they been dropped and beat pretty hard, both switches are fine and I use samsung cells and get between 3 to 4hrs per charge .
I'm very pleased with them and generally don't get much more than 18months out of an astro before it busted and you can't swap cells on astro like can on the braun plus easier get good lighting angle on the braun .
I got 2 of the copy astro's off ebay less than 10 bucks each use them at home as be lucky last 3 days of shop use as real flimsy low quality plastic, light output good but far from being durable.
I do wonder if current brauns have lesser quality switch as seen lot of complaints on more recent purchases during stock shortage period so wonder if part souring altered !
If your braun half as good as mine been it total bargain for 20bucks .