@sartoric - apologies, I misread and didn’t realize these are the repro steps:
start training with 10s screen timeout
pause training, allow the screen to timeout
click the lower right button when screen is timeout, note new lap created on SSU
I’m able to repro this on an SSU but not on the S5 with older FW 2.14.16.
The SSU is reasonably logically behavior. If the training is ended by clicking the “End” button when the display is lit, the new lap will have 0 seconds as its lap duration. Presumably resuming the training will start into the new lap created during the pause.
On the older FW S5, the lower right button press in screen timeout will bring up the anticipated training status screen ( Resume, Paused time, End ) and will not create a new lap. This also seems like the better choice.