Not showing on my 'Media Devices'

Hi Folks

A small glitch here...

Everything was running smoothly until yesterday. Although all the Logitech radios play around the house, I can't seem to pick up LMS on my mobile any longer. LMS is also not showing in my list of media devices either on my Windows 10 PC. I'm not too techy with this stuff, but I looked at the server log and it reported:

ain::init (387) Starting Logitech Media Server (v7.9.1, 1505480690, Fri Sep 15 13:17:40 CUT 2017) perl 5.014001 - MSWin32-x86-multi-thread
Slim::Utils::Misc::msg (1250) Warning: [06:29:04.3640] DBIx::Class::ResultSet::update_or_create(): Query returned more than one row. SQL that returns multiple rows is DEPRECATED for ->find and ->single at /<C:\PROGRA~2\SQUEEZ~1\server\SqueezeSvr.exe>Slim/Schema.pm line 1877
Slim::Plugin::UPnP::Events::error (323) Subscribe/unsubscribe error: 412 Precondition Failed
Slim::Plugin::UPnP::Events::error (323) Subscribe/unsubscribe error: 412 Precondition Failed
Slim::Plugin::UPnP::Events::error (323) Subscribe/unsubscribe error: 412 Precondition Failed

..does this mean anything relevant to the problem I'm experiencing?

Thanks guys! :)

PS I've tried reinstalling LMS but it hasn't helped - and even gone back to an earlier build temporarily, but that didn't change things either

Steve