Hi Yuqian,
Since the 1.0.1 is old firmware version, just for testing, try to downgrade the firmware on your gateway to either
Firmware version 1.0.33 (Released 09/25/2015)
OR
Firmware version 1.1.2 (Released 02/02/2016)
You can do this easily by registering your gateway in MultiTech DeviceHQ https://www.devicehq.com
Before doing the downgrade it’s important to save your configuration and then let DeviceHQ do the job for you after scheduling the downgrade to be done on next restart of the gateway. It will take a couple of hours or less depending on your internet connection.
Then test it with RN2483 firmware version 1.0.1 to check if it works better.
Later on, you may upgrade your gateway easily to any firmware version as all of them are available on DeviceHQ.
Another alternative is to do the firmware downgrade/upgrade for your gateway manually if you have the firmware file available on your system.