For one, it might be due to incorrect migration from 1.14.5 to 7.0.4, if you have updated with Keep settings option enabled, as the difference between the firmware versions is significant.
Thus, I would like you to reset your device to factory default settings, reconfigure it and try again.
Otherwise, I would like you to provide a topology of your network, to better understand the issue. Currently, it appears that you are able to ping an internet host (184.108.40.206), but unable to ping what is referred as the supplied gateway IP. What is its place in reference to your network?
Also, I would like you to attach a troubleshoot file to your question. Please, replicate the issue, then access router's WebUI, go to System -> Administration -> Troubleshoot section and download troubleshoot file from there.
The logs in the file might provide more insight into the issue.