Jugyo termtter → ver.1.0

手元の環境で、不定期に以下のエラーが発生します(termtterが落ちることはありません)

Error: getaddrinfo: Name or service not known /usr/local/lib/ruby/1.8/net/http.rb:560:in initialize' /usr/local/lib/ruby/1.8/net/http.rb:560:inopen' /usr/local/lib/ruby/1.8/net/http.rb:560:in connect' /usr/local/lib/ruby/1.8/timeout.rb:53:intimeout' /usr/local/lib/ruby/1.8/timeout.rb:93:in timeout' /usr/local/lib/ruby/1.8/net/http.rb:560:inconnect' /usr/local/lib/ruby/1.8/net/http.rb:553:in do_start' /usr/local/lib/ruby/1.8/net/http.rb:542:instart' /usr/local/lib/ruby/1.8/open-uri.rb:242:in open_http' /usr/local/lib/ruby/1.8/open-uri.rb:616:inbuffer_open' /usr/local/lib/ruby/1.8/open-uri.rb:164:in open_loop' /usr/local/lib/ruby/1.8/open-uri.rb:162:incatch' /usr/local/lib/ruby/1.8/open-uri.rb:162:in open_loop' /usr/local/lib/ruby/1.8/open-uri.rb:132:inopen_uri' /usr/local/lib/ruby/1.8/open-uri.rb:518:in open' /usr/local/lib/ruby/1.8/open-uri.rb:30:inopen' ./lib/termtter/twitter.rb:132:in open_uri' ./lib/termtter/twitter.rb:128:infetch_as_json' ./lib/termtter/twitter.rb:86:in get_timeline' ./lib/termtter/twitter.rb:40:inget_friends_timeline' ./lib/termtter/client.rb:286:in setup_update_timeline_task' ./lib/termtter/command.rb:64:incall' ./lib/termtter/command.rb:64:in execute' ./lib/termtter/client.rb:176:incall_commands' ./lib/termtter/task_manager.rb:55:in invoke_and_wait' ./lib/termtter/task_manager.rb:90:insynchronize' ./lib/termtter/task_manager.rb:53:in invoke_and_wait' ./lib/termtter/client.rb:171:incall_commands' ./lib/termtter/client.rb:163:in each' ./lib/termtter/client.rb:163:incall_commands' ./lib/termtter/client.rb:304:in setup_update_timeline_task' ./lib/termtter/task.rb:14:incall' ./lib/termtter/task.rb:14:in execute' ./lib/termtter/task_manager.rb:39:instep' ./lib/termtter/task_manager.rb:55:in invoke_and_wait' ./lib/termtter/task_manager.rb:90:insynchronize' ./lib/termtter/task_manager.rb:53:in invoke_and_wait' ./lib/termtter/task_manager.rb:38:instep' ./lib/termtter/task_manager.rb:37:in each' ./lib/termtter/task_manager.rb:37:instep' ./lib/termtter/task_manager.rb:30:in run' ./lib/termtter/task_manager.rb:28:ininitialize' ./lib/termtter/task_manager.rb:28:in new' ./lib/termtter/task_manager.rb:28:inrun' ./lib/termtter/client.rb:347:in run' ./run_termtter.rb:14