Some users of KISS FC and ESC24A reported sudden motor stops on their quads in flight. In some cases it’s just a failsafe event that triggers the FC to shut down the motors after a given time. So check your wiring and solder joints first and keep an eye on the RSSI values.
Though similar or even identical setups and motor/prop combinations of other users didn’t show this behaviour, in some cases it helped to set OneShot 125 instead of using OneShot 42
The reason for this is still unclear as for the vast majority it simply doesn’t happen and can’t be reproduced easily.
Other users reported the isuue went away after raising Min_Throttle to 1080 or higher.
Another approach is to power the FC through another source than directly from the lipo. Make sure you haven’t attached anything else on the power outputs of the FC than the receiver. Powering your OSD or VTX through the FC is NOT recommended!
In any case you should check your connections, wiring and joints properly.
Some users had electrical problems (lose wires or plugs) or overloaded the LDO by powering too much through the FC.