FYI. If you save the 202's backup file, you can open it with Notepad++ (it is xml file), and you can easily search any parameter in the file.
This can help you configure a new 200 or whatever as you will have a copy of each parameter, such as inbound call routes, digitmaps, etc.
As mentioned above, try a different power supply and check your firmware version.
FYI. There is some problem with OBiTalk portal sending configuration updates to devices (I have a post), so any changes you make in the config, be sure to log into the device locally by IP Address and confirm the changes. Make sure to submit and then reboot. We are currently making identical changes (I hope!) to both the OBiTalk portal and the local config as a workaround.