Thank you for your post, I am sorry to hear you have been seeing this problem.
When the operation fails on Updating Time this means the unit needs ot be LogLoaded. This is a simple process that updates the firmware inside the logger.
To do this you need to use the LogLoad program that is in the installation directory for Enviromon (it is usually inside another directory in here). This will open a box and this gives you instructions on how to reprogram the logger. Follow this all the way through until it asks if you wish to reprogram another logger.
If you have any problems then feel free to ring us and we can talk you through it.
Hope this helps