My layout is based on DC with electrical blocks. I have been using Atlas electrical controllers with sporadic results. Sometimes they work exactly as I planned and other times, it seems that there is what's best described as an electrical bleed off. I can shut off a block and it's still somehow getting power. Another time the switch will work exactly as it should. Any thoughts from anyone?
I would look to see if you are feeding the block through turnouts. Many are power routing. With a turnout thrown the right way, you could still be powering the block. good luck!
You did not mention the switch part number, that might help others respond. I do not use Atlas electrical switchs. If a particular block gives you trouble, but another does not... Swap the switches around and see if the trouble remains with the original block or moves to the new block.
From personal experience over 50 years or more, I can say it is VERY rare to have an Atlas electrical component fail. Doug
That center off position isn't so easy to hit with a slide switch. I use toggles and rotary switches.