I finnally figured out why always a Yellow Alert and Yellow Alert Solved Sound is triggered even though i never set one up.
I found a source that probably is caused by stocking Atmosuit Checkpoints with Sweep Yellow Alert Erands.
As soon they are stocked and a Duplicant puts them on thos weird Yellow Alerts fires in 1 Tick.
I watched Duplicants put on suits and hear the noice triggerd. At all those stations every exact time the took them on.
- Set the Suit as Sweep Erand as Yellow Alert and see them deliverd to the asking Atmosuit Station
- Wait for the Duplicants to put them back on.