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Hi I have a number of BR340 that power on and they stay up for approx. 30 - 120 seconds then die, and after another 30 seconds they power on again and start the cycle over.
They are all using external power supplies. We have installed 15 on this site and only 10 are working correctly with 2 having dead power supplies and the other 3 cycle as started above.
I´ve installed many BR340 and I´ve never seen this before. It seems a harware problem.
I've seen several BR340s do the same thing. It's almost always the power supply. Swap a "good" one for one of the ones messing up. We have had to replace several supplies over the past couple of years.