[Elecraft] K3S: Partial amnesia ''Config PTT''

[Udo Langenohl - DK5YA]

My K3S is suffering from partial amnesia. The radio always forgets the 
Config: PTT settings (DTR -- RTS) after shut down. USB is set to RS232.

I remember well when this has happened before to one of my older K3 
radios still sitting here in the shack and there was a solution I 
unfortunatley can't remember. Any suggestion please?

73 Udo, DK5YA