WP-34S: Stopwatch - bug, feature, or user error?

[pascal_meheut]

This is a "bug/feature" and if I remember correctly, it has to do with the energy saving mode. After a few minutes, we loose the data structures used to keep track of the stopwatch mode.
The alternative would be to prevent the WP-34s to go into deep sleep when stopped in stopwatch mode but at the risk of eating the batteries.

Maybe there is a solution but nothing comes to mind (well, to my mind at least).