The rare event of a open() fail can still occur when you switch app

this will fix it

src/config/constants.js

@@ -6,7 +6,7 @@ export const CHECK_APP_INTERVAL_WHEN_INVALID = 600
 export const CHECK_APP_INTERVAL_WHEN_VALID = 1200
 export const CHECK_UPDATE_DELAY = 5e3
 
-export const DEVICE_DISCONNECT_DEBOUNCE = 1000
+export const DEVICE_DISCONNECT_DEBOUNCE = 500
 
 export const MODAL_ADD_ACCOUNT = 'MODAL_ADD_ACCOUNT'
 export const MODAL_OPERATION_DETAILS = 'MODAL_OPERATION_DETAILS'

src/helpers/deviceAccess.js

@@ -2,6 +2,7 @@
 import createSemaphore from 'semaphore'
 import type Transport from '@ledgerhq/hw-transport'
 import TransportNodeHid from '@ledgerhq/hw-transport-node-hid'
+import { retry } from './promise'
 
 // all open to device must use openDevice so we can prevent race conditions
 // and guarantee we do one device access at a time. It also will handle the .close()
@@ -17,7 +18,7 @@ export const withDevice: WithDevice = devicePath => {
 
   return job =>
     takeSemaphorePromise(sem, async () => {
-      const t = await TransportNodeHid.open(devicePath)
+      const t = await retry(() => TransportNodeHid.open(devicePath), { maxRetry: 1 })
       try {
         const res = await job(t)
         // $FlowFixMe