Help to resolve issue with CCcam 2.3.0

Dear all, please help with "freezing" channels. Usualy and on most channels everything is OK and debug log contains every 10 seconds records like this ones

...
23:27:33.542 CCcam: cam[0] ecm odd ok caid:0xd96 id:0x0 pid:0x1609 Unknown
23:27:37.400 CCcam: remote ecm -> s14.csserv.co:13150 0xd96(0x000)
23:27:38.478 CCcam: remote ecm <- s14.csserv.co:13150 ok
...


But certain channels often "freezes", debug log then contains records like this ones

...
23:31:40.635 CCcam: cam[0] ecm even nok caid:0x500 id:0x51910 pid:0x606 Unknown
23:31:40.832 CCcam: remote ecm -> s14.csserv.co:13150 0xd96(0x000)
23:31:46.234 CCcam: remote ecm <- s14.csserv.co:13150 error
23:31:46.234 CCcam: remote ecm -> s14.csserv.co:13150 0xd96(0x000)
23:31:51.778 CCcam: remote ecm <- s14.csserv.co:13150 error
23:31:51.778 CCcam: remote ecm -> s19.csserv.co:14400 0xd96(0x000)
23:31:56.800 CCcam: remote ecm <- s19.csserv.co:14400 error
23:31:56.800 CCcam: remote ecm -> s19.csserv.co:14400 0xd96(0x000)
23:31:57.165 CCcam: remote ecm <- s19.csserv.co:14400 error
23:31:57.165 CCcam: remote ecm -> s21.csserv.co:13150 0xd96(0x000)
23:31:59.397 CCcam: remote ecm <- s21.csserv.co:13150 error
23:31:59.397 CCcam: remote ecm -> s21.csserv.co:13150 0xd96(0x000)
23:32:01.591 CCcam: remote ecm <- s21.csserv.co:13150 error
...


Sometimes these "freezes" takes too long even 2 minutes!

Let me please know your opinion why on some channel this happens and on others not.

SNR = 15.8dB on all channels.

Thanks and Regards.

... and in time of "freeze" there are another records in /var/log/messsages

Apr 10 00:24:00 dm500hd user.warn kernel: [ 868.785000] ch0: unlock
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.380000] ch0: lock
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.380000] audio_sampling_rate_info_isr: 4 callbacks suppressed
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.380000] RAP sampling rate info isr (44100)
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.380000] eModeChange Isr.. set source_changed_event!
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.380000] ch0: unlock
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.731000] rap watchdog flush!
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.731000] flush audio decode
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.733000] audio delay 18000 (200 ms)
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.734000] total video delay: 18000 (200 ms)
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.911000] RAP first pts 0x5c69112a, stc 0xa7f0454e, pcr valid
Apr 10 00:24:12 dm500hd user.warn kernel: [ 880.914000] audio_cdb_itb_error_isr! underflow