diff --git a/.gitignore b/.gitignore
index 5e3c3eb..ca9e6ec 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+*.log
 *.servers.lua
 examples/*/itte*.lua
 !hellobot.servers.lua
diff --git a/examples/ramenkan/ramenkan.config.lua b/examples/ramenkan/ramenkan.config.lua
index aa75da4..6c8b8f2 100644
--- a/examples/ramenkan/ramenkan.config.lua
+++ b/examples/ramenkan/ramenkan.config.lua
@@ -369,7 +369,7 @@ end
 -- ---------------------------------------------------------------------------
 
 itte_config = {
-  debug = false,
+  debug = true,
   messages = {
     help = "一、二、三、らーめん缶！ Hello, I am a ramen vending machine. " ..
       "Please type a code for service: {{codes}}  " ..
diff --git a/itte.lua b/itte.lua
index de80eb2..1788b32 100644
--- a/itte.lua
+++ b/itte.lua
@@ -58,7 +58,7 @@ itte.config = {
     send = { "send" },
     svrs_not_found = { "config", "Error: servers not found." },
     task_added = { "task", "Task `{{name}}` added." },
-    task_activated = { "task", "Task `{{name}}` activated at {{ts}}." },
+    task_activated = { "task", "Task `{{name}}` activated." },
   },
 }
 
@@ -836,7 +836,7 @@ function itte.listen(name, str)
   local cxt = itte.contexts[name]
 
   -- Respond to server ping
-  if util.is_substr(str, cxt.cmds.ping.check) then
+  if string.find(str, cxt.cmds.ping.check) == 1 then
     cxt.state.ping_time = os.time()
     util.debug(itte.config.debugs.listen[1], str, itte.config.debug)
     itte.send_command(cxt.con, string.gsub(str, cxt.cmds.ping.check,
@@ -871,6 +871,10 @@ function itte.listen(name, str)
         itte.message(cxt, { msg.reply_to }, itte.config.errors.unknown_code)
       end
     end
+
+  -- Output to stdout anyway if debug is enabled
+  else
+    util.debug(itte.config.debugs.listen[1], str, itte.config.debug)
   end
 end
 
@@ -886,13 +890,6 @@ function itte.add_listener(cxt)
   if data ~= nil then
     itte.listen(cxt.name, data)
 
-  -- Send a pong every 120s in case the ping request was lost, e.g. during high
-  -- system load. Servers may send a ping request every ~90s. Disconnects from
-  -- ping timeouts occur at ~2m30s.
-  elseif (cxt.state.ping_time > 0) and (delta > 120) then
-    itte.send_command(cxt.con, cxt.cmds.ping.resp)
-    cxt.state.ping_time = os.time()
-
   elseif status == "closed" then
     itte.disconnect_server(cxt.name)
   end
@@ -914,7 +911,6 @@ function itte.add_tasks(cxt)
       local ts = os.date("%Y-%m-%d %H:%M:%S", os.time())
       local task_str = string.gsub(itte.config.debugs.task_activated[2],
         "{{name}}", name)
-      task_str = string.gsub(task_str, "{{ts}}", ts)
       util.debug(itte.config.debugs.task_activated[1], task_str,
         itte.config.debug)
       itte.handlers[task.handler](cxt, task)
@@ -947,8 +943,9 @@ function itte.check_tasks(cxt)
 
   local dt = util.split_str(os.date("%w %Y %m %d %H %M", os.time()))
   -- Support preset minute intervals
-  local interval_min = { 5, 10, 15, 20, 30 }
+  local interval_min = { 2, 5, 10, 15, 20, 30 }
   for name, task in pairs(cxt.tasks) do
+    if task.time == nil then task.time = "00:00" end
     local task_min = string.sub(task.time, string.find(task.time, ":") + 1,
       string.find(task.time, ":") + 2)
     if (util.has_key(interval_min, tonumber(task.interval:sub(1, -2))) and
@@ -960,10 +957,29 @@ function itte.check_tasks(cxt)
       (task.interval == "monthly" and task.day == dt[4] and
         task.time == dt[5] .. ":" .. dt[6])
       then
-      -- Run only once per interval
-      while not task.done do
+
+      -- Activate task if not already done in the current interval
+      if not task.done then
         coroutine.resume(task.co, name, task)
+
+      elseif (task.done) and (coroutine.status(task.co) == "dead") then
+        -- Reconstruct the task coroutine after it has been done
+        local co = function(name, task)
+          if util.has_key(itte.handlers, task.handler) then
+            local ts = os.date("%Y-%m-%d %H:%M:%S", os.time())
+            local task_str = string.gsub(itte.config.debugs.task_activated[2],
+              "{{name}}", name)
+            util.debug(itte.config.debugs.task_activated[1], task_str,
+              itte.config.debug)
+            itte.handlers[task.handler](cxt, task)
+            -- Suspend coroutine to be reactivated later
+            coroutine.yield(co)
+            task.done = true
+          end
+        end
+        task.co = coroutine.create(co)
       end
+
     else
       -- Reset the done flag after running task
       task.done = false
diff --git a/itteutil.lua b/itteutil.lua
index 63b7b9e..f3f30e9 100644
--- a/itteutil.lua
+++ b/itteutil.lua
@@ -256,7 +256,8 @@ itteutil.docs.debug = [[  (tag_str, debug_str [, enabled_bool])
   ]]
 function itteutil.debug(tag, str, enabled)
   if enabled then
-    print("[" .. tag .. "] " .. str)
+    local ts = os.date("%Y-%m-%d %H:%M:%S", os.time())
+    print("[" .. ts .. "][" .. tag .. "] " .. str)
   end
 end