Guard "disconnects" from libnotify after a while

[istrasci]

I've set up my Guardfile to use libnotify to show notifications, mainly for RSpec tests.

notification :libnotify if RUBY_PLATFORM =~ /linux/i

It works and correctly displays the notifications (rails start up, rspec passes/fails, etc.). But after a "while", it seems to "disconnect" from the libnotify system, and will no longer display them. I've run guard in debug mode, but the debug output is the same whether the notifications display or not, so I'm not including the output here.

This happens on both my home and work machines. Has anyone experienced this behaviour?

Home machine environment:

» ruby -v
ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-linux]
» bundle show guard
/home/istrasci/.rvm/gems/ruby-2.4.2/gems/guard-2.14.1
» bundle show guard-rspec
/home/istrasci/.rvm/gems/ruby-2.4.2/gems/guard-rspec-4.7.3
» uname -a
Linux mint17VB 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux