Could you please generate a troubleshoot file from your router and attach it to this query or send it to me via private message? I'll leave instructions regarding how to generate the troubleshoot file as well as brief description about what it is below.
What's a troubleshoot file and how to generate it?
A Troubleshoot file contains the device's event logs, configuration files and other information useful for diagnostics. It can be downloaded from your device's WebUI, Troubleshoot page:
System → Administration → Troubleshoot