Neither the Auslogics or Microsoft Disk Defragmenters defragment the pagefile. If you allow Windows to manage the pagefile and the free disk space is less than 50% of the volume in which the pagefile resides, the pagefile fragments.
The way to avoid this problem is to place the pagefile in it's own partition or to have a fixed minimum = maximum pagefile created before the free disk space reduces below 50%.
This Article tells you how to get round the problem using the Auslogics utility
http://www.auslogics.com/en/articles/how-to-defrag/
Whther the Auslogics solution always works is questionable. To recreate the pagefile you have to restart the computer. The shutdown causes entries to be written to files so that if there was already limited free disk space these entries start the fragmentation process once again. The new pagefile is created early in the boot process but the files and free disk space have already started to fragment. The Auslogics solution will certainly improve the situation but less so if the free disk space is say only 20% of the drive.
Hope this helps, Gerry Cornell