Remmina closes open ssh sessions after losing focus, what should I do?

Question

linux

The essence of the problem: open sessions through RDP can be open for days and not spontaneously close. But it's worth connecting to someone via ssh there, as soon as the focus from the console is lost, after a small but arbitrary interval, the console closes. If you don’t switch anywhere from it, then at least 10-15 minutes everything is fine, I didn’t try further. sftp via remmina also works and does not close.
There are similar problems on the Internet, but they are very diverse and usually unrelated. Tried reinstalling packages (remove, purge), didn't help.
Already endured how many package updates but nothing has changed. I don’t know which version of the problem, but 3 months ago everything worked and did not crash. During this time, nothing new was installed. I did not see any session breaks in the logs, the usual terminal works. Can anyone come across this?
Host: Ubuntu 14.04 LTS x64
Package Versions:
remmina 1.2.0~rcgit-11+901+next+201605221547~ubuntu14.04.1
remmina-common 1.2.0~rcgit-11+901+next+201605221547~
ubuntu14.04.1 -rdp 1.2.0~rcgit-11+901
+next+201605221547~ubuntu14.04.1