No more issues concerning unresponsiveness after update to version 1924, so that's great. Thanks.
I'm still seeing the socketexceptions in the logs though and sometimes quite a lot:
21:00:00,029 WARN StunUdpSocket - STUN-UDP-pool-40-thread-1749 [id: 0x5935f9c6, /172.xx.xx.xxx:31618]...