[T48G][BLF] Blf on T48G strange issues

[Samael28]

Hi!
I'm working with T48G and Freeswitch. Main issue I get with BLF. It's working great, but for a limited time. After rebooting nearly for 1 hour all is ok. But when some times passed - BLF extensions can turns grey for a some time, than - turn green back and than - just can't update when someone is talking. Also there is a problem with a Day/Night switch (Normally - you subscribe to extension, and receive ONLY changes to this even, simple SUBSCRIBE gives you Not Registered, but than you receive NOTIFY on this).
Is there any parameter like SUBSCRIBE timeout to set it to "Not update, just Subscribe on reboot or once a day" or so? Can't find this one in provision or web interface.