This type of repeat activation can occur for users that have a changing MAC or Physical Address for the primary connection.
To see if this is the problem for you please record your Mac address then the next time you are prompted for activation record this info again.
To find out the MAC address:
1) Go to the Start Menu -> Run. Type "cmd" and click on OK to bring up a command prompt.
2) At the command prompt type "ipconfig /all > c:ipconfig.txt"
This will create a file in your C drive called ipconfig.txt. This file will have the MAC address in it.
Please record these values and compare them to see if it is changing for you. If this MAC address changes then you will be prompted for activation again. Please get back to us with the result.