Freezes, if you tune to a TV channel that does not have broadcast at the moment.

[Jarno Suni]

MythTV Frontend becomes unresponsive, if you switch to a TV channel that does not have broadcast.

After a while, program returns to main menu, and a dialog tells: "Error opening jump program file buffer". If I try to watch TV again, a dialog tells: "All tuners are currently busy." Program responds to commands very slowly. In terminal I see rows like

<clip>
2017-09-20 19:44:09.149999 I MythCoreContext::ConnectCommandSocket(): Connecting to backend server: 192.168.100.51:6543 (try 1 of 1)
2017-09-20 19:44:16.180626 E MythSocket(7f3c14020c70:51): ReadStringList: Error, timed out after 7000 ms.
2017-09-20 19:44:16.181125 C Protocol version check failure.
   The response to MYTH_PROTO_VERSION was empty.
   This happens when the backend is too busy to respond,
   or has deadlocked due to bugs or hardware failure.
</clip>

Workaround:
I have to kill frontend and run
sudo service mythtv-backend restart
in server to get it work again.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mythtv-frontend 2:0.28.0+fixes.20160413.15cf421-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
NonfreeKernelModules: nvidia_uvm wl nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Feb 10 22:33:56 2017
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-01-05 (36 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
Installed_mythtv_dbg: 0.0
MythTVDirectoryPermissions:
 total 8
 drwxrwsr-x 2 mythtv mythtv 4096 tammi 6 00:19 bare-client
 drwxr-xr-x 2 root root 4096 huhti 19 2016 videos
SourcePackage: mythtv
UpgradeStatus: No upgrade log present (probably fresh install)