Thank you for your attention. Following your email, date/time issue is now resolved.

@David-TP Thanks. I am in fact already using the google public DNS servers, so will take a look at the firmware. Thanks.

@David-TP Hi David - Yes, per my original post, I have tried changing the time zone via the web interface several times. Always still the same error. I have just done it again, changing the continent...

@pjs_gsy CRITICAL log shown below. Current data. TP-Link, please help resolve. Appears to be a bug - These units have been in place some time, for the most part are working. Have been...

@pjs_gsy I did not notice it before, but, in the web interface. So, I am correct. NTP is not working athd the units do not have the correct time. There are no internet access issues.

@ImtiazAli It's actually the current log. I guess if NTP is failing, it does not have the correct date/time? I go in via the web interface. I actually used the 'clear all' to clear the log. Wait a...