I use it on Windows 8.1 with SIP account (Asterisk 11.16, FreePBX 12) on local network.
Randomly online contacts disappear (all or only a few) from contactlist. I try to select Offline/Online account, but contacts do not appear. Only when Quit/enter program I see back the online contacts on the list.
Jitsi stable 2.9.5441, 32 bits
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