RFC Sender registration is lost after a while

Hi Experts,
I'm facing a strange problem with the RFC Sender adapter. Everything is well configured, and communications works well.
But... If I do not use the communication channel for a while, the program registration in backend system is lost. It does not appear in transaction SMGW, and all asynchronous RFC calls cumulate in transaction SM58, with error message "/ CPIC-CALL: 'ThSAPECMINIT' : cmRc=2 thRc=679".
Then I need to deactivate / reactivate the communication channel and everything works well again.
For now, I'm in Dev environment, but I would like to find a solution before going in Prod !
Thanks a lot for your help !

Hi !
Maybe this can help:
Defining SLD RFC destination
SAP Note 827872
Regards,
Matias

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