Path to external storage is /storage/external_SD.
I tried to clear Airdroid data to make a fresh launch and the problem persist.
The phone is LG L90 on stock Lollipop 5.0.2.
About main log, I think there is no relevant info to help in this issue:
2015-11-10 00:52:53,026 - [INFO -GCMRegistrationService] - gcmRegistration
2015-11-10 00:52:54,861 - [INFO -GCMRegistrationService] - GCM Register on Server Failed. Retry later: 2000
2015-11-10 00:52:56,445 - [WARN -com.sand.airdroid.servers.managers.event.EventServiceManager] - startEventService
2015-11-10 00:52:57,146 - [INFO -PushMessageHandleService] - Receive PushMsg: { "ptype": "pushclient_config", "body": { "active_users_threshold": 10, "connecting_timeout": 30, "reconnect_interval": 10, "reconnect_max_num": 10, "heartbeat_interval": 300, "heartbeat_retry_num": 5, "heartbeat_retry_interval": 30, "heartbeat_timeout": 10, "gopush_enable": true, "ping_device_max_number": 5, "ping_device_interval": 60, "ping_device_expire": 0 } }
2015-11-10 00:52:58,671 - [INFO -GCMRegistrationService] - GCM Register on Server Failed. Retry later: 4000
2015-11-10 00:53:04,295 - [INFO -GCMRegistrationService] - GCM Register on Server Succeed.
2015-11-10 00:55:34,266 - [INFO -AirDroidService] - cause by stop code 6
2015-11-10 00:55:38,781 - [WARN -com.sand.airdroid.servers.managers.event.EventServiceManager] - startEventService