The technical support is active in the Discord, just go to the right channel and ping them with "@Masternode support". From my personal experience though, might just need to run the "xdnad -listen=0", try it, it doesn't do any harm.
It seems to me that your advice has helped me. My masternoda works steadily for more than half an hour.
Once again I want to thank you and say that changing the value "listen=0" helped. My masternode worked well all day long!