I'm sorry, but there's no way to manually restart Couatl.exe after it crashed, because it would need to re-establish communication with the sim with a broken channel that can only be reinstated with a sim restart.
In fact, a problem with the communication with the sim, might just be what caused the crash in the first place but, without a proper error log or reproduction steps, it would be impossible to say why the communication was interrupted to begin with, because it can be anything, even too many other addons flooding Simconnect with too many commands, that the sim cannot cope with them anymore, so it stops to talk with our program.
But again, not possible to say for sure without a reproducible example.