Shoot us an email at support@wyday.com and include a few of the product keys. Also, deactivate the current activation in LimeLM to let the user reactivate.
My guess is that the user(s) changed enough components in their computer so that TurboActivate thinks it's a different computer. In the future if they want to do that without having to bother you, they should first deactivate, then make all the large computer changes, then reactivate.