It is not a known issue.
Could you provide more details about your device/firmware/configuration.
Are Teamviewer disconnects followed by general connectivity issues from the device?
Do the disconnects happen after some specific time or are rather random?
Preferably a troubleshoot file, generated after disconnection, might provide more insight. To generate the file, access router's WebUI, go to System -> Administration -> Troubleshoot section and download troubleshoot file from there. Attach the file by editing your question.