770 ports. Happens with a very few calls right after boot. Progressing in time though (more and more channels will become unusable). After another reboot and for N-next ones all is fine regardless of load or uptime. I will try to gather more debug information. Was just hoping to gather some ideas.
Only thing that comes in mind: I'm doing gc_OpenEx and initial lines reset asynchronous... migt there be any concurency?