My network logs have similar critical messages plus error messages and warning messages.
Need reliable internet access for remote oncall working 24/7 fed up with being told it is working fine now.
Always best to start your own thread:
If you start one, can you post your Hub status and logs? Someone should be spot if there is a problem Navigate to http://192.168.0.1 (or http://192.168.100.1 - if in modem mode) Don't log in! Click on 'router status' Copy/paste the data from each of the tabs. The forum software will remove the MAC addresses for you (you may need to click the 'post' button again).