diff --git a/lib/notifier.js b/lib/notifier.js
index d93851a5..58be2b48 100644
--- a/lib/notifier.js
+++ b/lib/notifier.js
@@ -3,12 +3,13 @@ const _ = require('lodash/fp')
 const prettyMs = require('pretty-ms')
 const numeral = require('numeral')
 
-const db = require('./postgresql_interface')
+const dbm = require('./postgresql_interface')
+const db = require('./db')
 const T = require('./time')
 const logger = require('./logger')
 
 const STALE_STATE = 2 * T.minute
-const NETWORK_DOWN_TIME = T.minute
+const NETWORK_DOWN_TIME = 1 * T.minute
 const ALERT_SEND_INTERVAL = T.hour
 
 const PING = Symbol('PING')
@@ -87,23 +88,7 @@ function checkNotification (plugins) {
   .catch(logger.error)
 }
 
-const getDeviceTime = _.flow(_.get('device_time'), _.unary(parseInt))
-
-function checkPing (deviceEvents) {
-  const sortedEvents = _.sortBy(getDeviceTime, _.map(jsonParse, deviceEvents))
-  const lastEvent = _.last(sortedEvents)
-
-  if (!lastEvent) {
-    return [{code: PING}]
-  }
-
-  const age = Math.floor(lastEvent.age)
-  if (age > NETWORK_DOWN_TIME) {
-    return [{code: PING, age: age}]
-  }
-
-  return []
-}
+const getDeviceTime = _.flow(_.get('device_time'), Date.parse)
 
 function dropRepeatsWith (comparator, arr) {
   const iteratee = (acc, val) => val === acc.last
@@ -137,26 +122,54 @@ function checkStuckScreen (deviceEvents) {
   return []
 }
 
+function checkPing (deviceId) {
+  const sql = `select (EXTRACT(EPOCH FROM (now() - created))) * 1000 AS age from machine_pings
+    where device_id=$1
+    order by created desc
+    limit 1`
+
+  return db.oneOrNone(sql, [deviceId])
+  .then(row => {
+    if (!row) return [{code: PING}]
+    if (row.age > NETWORK_DOWN_TIME) return [{code: PING, age: row.age}]
+    return []
+  })
+}
+
+function checkPings (devices) {
+  const deviceIds = _.map('deviceId', devices)
+  const promises = _.map(checkPing, deviceIds)
+
+  return Promise.all(promises)
+  .then(_.zipObject(deviceIds))
+}
+
 function checkStatus (plugins) {
   const alerts = {devices: {}, deviceNames: {}}
 
-  return Promise.all([plugins.checkBalances(), db.machineEvents(), plugins.getMachineNames()])
+  return Promise.all([plugins.checkBalances(), dbm.machineEvents(), plugins.getMachineNames()])
   .then(([balances, events, devices]) => {
-    alerts.general = balances
-    devices.forEach(function (device) {
-      const deviceId = device.deviceId
-      const deviceName = device.name
-      const deviceEvents = events.filter(function (eventRow) {
-        return eventRow.device_id === deviceId
+    return checkPings(devices)
+    .then(pings => {
+      alerts.general = balances
+      devices.forEach(function (device) {
+        const deviceId = device.deviceId
+        const deviceName = device.name
+        const deviceEvents = events.filter(function (eventRow) {
+          return eventRow.device_id === deviceId
+        })
+
+        const ping = pings[deviceId] || []
+        const stuckScreen = checkStuckScreen(deviceEvents)
+
+        const deviceAlerts = _.isEmpty(ping) ? stuckScreen : ping
+
+        alerts.devices[deviceId] = deviceAlerts
+        alerts.deviceNames[deviceId] = deviceName
       })
 
-      const deviceAlerts = checkStuckScreen(deviceEvents).concat(checkPing(deviceEvents))
-
-      alerts.devices[deviceId] = deviceAlerts
-      alerts.deviceNames[deviceId] = deviceName
+      return alerts
     })
-
-    return alerts
   })
 }
 
diff --git a/lib/poller.js b/lib/poller.js
index 32d59acb..5a639d6a 100644
--- a/lib/poller.js
+++ b/lib/poller.js
@@ -12,7 +12,7 @@ const SWEEP_HD_INTERVAL = T.minute
 const TRADE_INTERVAL = 10 * T.seconds
 const PONG_INTERVAL = 10 * T.seconds
 const PONG_CLEAR_INTERVAL = 1 * T.day
-const CHECK_NOTIFICATION_INTERVAL = 30 * T.seconds
+const CHECK_NOTIFICATION_INTERVAL = 20 * T.seconds
 const PENDING_INTERVAL = 10 * T.seconds
 
 let _pi, _settings