diff --git a/ui/app/actions.js b/ui/app/actions.js
index 1edf692b6..41fc3c504 100644
--- a/ui/app/actions.js
+++ b/ui/app/actions.js
@@ -175,6 +175,8 @@ var actions = {
   CLEAR_SEND: 'CLEAR_SEND',
   OPEN_FROM_DROPDOWN: 'OPEN_FROM_DROPDOWN',
   CLOSE_FROM_DROPDOWN: 'CLOSE_FROM_DROPDOWN',
+  GAS_LOADING_STARTED: 'GAS_LOADING_STARTED',
+  GAS_LOADING_FINISHED: 'GAS_LOADING_FINISHED',
   setGasLimit,
   setGasPrice,
   updateGasData,
@@ -190,6 +192,8 @@ var actions = {
   updateSendErrors,
   clearSend,
   setSelectedAddress,
+  gasLoadingStarted,
+  gasLoadingFinished,
   // app messages
   confirmSeedWords: confirmSeedWords,
   showAccountDetail: showAccountDetail,
@@ -740,8 +744,9 @@ function updateGasData ({
   to,
   value,
 }) {
-  const estimatedGasPrice = estimateGasPriceFromRecentBlocks(recentBlocks)
   return (dispatch) => {
+    dispatch(actions.gasLoadingStarted())
+    const estimatedGasPrice = estimateGasPriceFromRecentBlocks(recentBlocks)
     return Promise.all([
       Promise.resolve(estimatedGasPrice),
       estimateGas({
@@ -762,14 +767,28 @@ function updateGasData ({
     .then((gasEstimate) => {
       dispatch(actions.setGasTotal(gasEstimate))
       dispatch(updateSendErrors({ gasLoadingError: null }))
+      dispatch(actions.gasLoadingFinished())
     })
     .catch(err => {
       log.error(err)
       dispatch(updateSendErrors({ gasLoadingError: 'gasLoadingError' }))
+      dispatch(actions.gasLoadingFinished())
     })
   }
 }
 
+function gasLoadingStarted () {
+  return {
+    type: actions.GAS_LOADING_STARTED,
+  }
+}
+
+function gasLoadingFinished () {
+  return {
+    type: actions.GAS_LOADING_FINISHED,
+  }
+}
+
 function updateSendTokenBalance ({
   selectedToken,
   tokenContract,
diff --git a/ui/app/components/customize-gas-modal/index.js b/ui/app/components/customize-gas-modal/index.js
index c8522a3c7..cd8f76ed5 100644
--- a/ui/app/components/customize-gas-modal/index.js
+++ b/ui/app/components/customize-gas-modal/index.js
@@ -33,6 +33,7 @@ const {
 const {
   getGasPrice,
   getGasLimit,
+  getGasIsLoading,
   getForceGasMin,
   conversionRateSelector,
   getSendAmount,
@@ -51,6 +52,7 @@ function mapStateToProps (state) {
   return {
     gasPrice: getGasPrice(state),
     gasLimit: getGasLimit(state),
+    gasIsLoading: getGasIsLoading(state),
     forceGasMin: getForceGasMin(state),
     conversionRate,
     amount: getSendAmount(state),
@@ -73,7 +75,7 @@ function mapDispatchToProps (dispatch) {
   }
 }
 
-function getOriginalState (props) {
+function getFreshState (props) {
   const gasPrice = props.gasPrice || MIN_GAS_PRICE_DEC
   const gasLimit = props.gasLimit || MIN_GAS_LIMIT_DEC
 
@@ -97,7 +99,11 @@ inherits(CustomizeGasModal, Component)
 function CustomizeGasModal (props) {
   Component.call(this)
 
-  this.state = getOriginalState(props)
+  const originalState = getFreshState(props)
+  this.state = {
+    ...originalState,
+    originalState,
+  }
 }
 
 CustomizeGasModal.contextTypes = {
@@ -106,6 +112,36 @@ CustomizeGasModal.contextTypes = {
 
 module.exports = connect(mapStateToProps, mapDispatchToProps)(CustomizeGasModal)
 
+CustomizeGasModal.prototype.componentWillReceiveProps = function (nextProps) {
+  const currentState = getFreshState(this.props)
+  const {
+    gasPrice: currentGasPrice,
+    gasLimit: currentGasLimit,
+  } = currentState
+  const newState = getFreshState(nextProps)
+  const {
+    gasPrice: newGasPrice,
+    gasLimit: newGasLimit,
+    gasTotal: newGasTotal,
+  } = newState
+  const gasPriceChanged = currentGasPrice !== newGasPrice
+  const gasLimitChanged = currentGasLimit !== newGasLimit
+
+  if (gasPriceChanged) {
+    this.setState({
+      gasPrice: newGasPrice,
+      gasTotal: newGasTotal,
+      priceSigZeros: '',
+      priceSigDec: '',
+    })
+  }
+  if (gasLimitChanged) {
+    this.setState({ gasLimit: newGasLimit, gasTotal: newGasTotal })
+  }
+  if (gasLimitChanged || gasPriceChanged) {
+    this.validate({ gasLimit: newGasLimit, gasTotal: newGasTotal })
+  }
+}
 
 CustomizeGasModal.prototype.save = function (gasPrice, gasLimit, gasTotal) {
   const {
@@ -137,7 +173,7 @@ CustomizeGasModal.prototype.save = function (gasPrice, gasLimit, gasTotal) {
 }
 
 CustomizeGasModal.prototype.revert = function () {
-  this.setState(getOriginalState(this.props))
+  this.setState(this.state.originalState)
 }
 
 CustomizeGasModal.prototype.validate = function ({ gasTotal, gasLimit }) {
@@ -233,7 +269,7 @@ CustomizeGasModal.prototype.convertAndSetGasPrice = function (newGasPrice) {
 }
 
 CustomizeGasModal.prototype.render = function () {
-  const { hideModal, forceGasMin } = this.props
+  const { hideModal, forceGasMin, gasIsLoading } = this.props
   const { gasPrice, gasLimit, gasTotal, error, priceSigZeros, priceSigDec } = this.state
 
   let convertedGasPrice = conversionUtil(gasPrice, {
@@ -266,7 +302,7 @@ CustomizeGasModal.prototype.render = function () {
     toNumericBase: 'dec',
   })
 
-  return h('div.send-v2__customize-gas', {}, [
+  return !gasIsLoading && h('div.send-v2__customize-gas', {}, [
     h('div.send-v2__customize-gas__content', {
     }, [
       h('div.send-v2__customize-gas__header', {}, [
@@ -288,6 +324,7 @@ CustomizeGasModal.prototype.render = function () {
           onChange: value => this.convertAndSetGasPrice(value),
           title: this.context.t('gasPrice'),
           copy: this.context.t('gasPriceCalculation'),
+          gasIsLoading,
         }),
 
         h(GasModalCard, {
@@ -297,6 +334,7 @@ CustomizeGasModal.prototype.render = function () {
           onChange: value => this.convertAndSetGasLimit(value),
           title: this.context.t('gasLimit'),
           copy: this.context.t('gasLimitCalculation'),
+          gasIsLoading,
         }),
 
       ]),
diff --git a/ui/app/reducers/app.js b/ui/app/reducers/app.js
index 4e9d0848c..9cacf5fe7 100644
--- a/ui/app/reducers/app.js
+++ b/ui/app/reducers/app.js
@@ -62,6 +62,7 @@ function reduceApp (state, action) {
     warning: null,
     buyView: {},
     isMouseUser: false,
+    gasIsLoading: false,
   }, state.appState)
 
   switch (action.type) {
@@ -675,6 +676,16 @@ function reduceApp (state, action) {
         isMouseUser: action.value,
       })
 
+    case actions.GAS_LOADING_STARTED:
+      return extend(appState, {
+        gasIsLoading: true,
+      })
+
+    case actions.GAS_LOADING_FINISHED:
+      return extend(appState, {
+        gasIsLoading: false,
+      }) 
+
     default:
       return appState
   }
diff --git a/ui/app/selectors.js b/ui/app/selectors.js
index a29294b86..cf0affe9c 100644
--- a/ui/app/selectors.js
+++ b/ui/app/selectors.js
@@ -16,6 +16,7 @@ const selectors = {
   transactionsSelector,
   accountsWithSendEtherInfoSelector,
   getCurrentAccountWithSendEtherInfo,
+  getGasIsLoading,
   getGasPrice,
   getGasLimit,
   getForceGasMin,
@@ -117,6 +118,10 @@ function transactionsSelector (state) {
       .sort((a, b) => b.time - a.time)
 }
 
+function getGasIsLoading (state) {
+  return state.appState.gasIsLoading
+}
+
 function getGasPrice (state) {
   return state.metamask.send.gasPrice
 }