The dedicated hosts seam to randomly purge the saved games no matter what number of days is set in the "Saved Games Purge Days" option.
Sometimes it gets triggered by a restart, sometimes it just happens while they are running.
I wasn't able to check if it happens while games are played on them, yet.
I'll attach a file with some random purges happening.
All from one ded host and they all happened in a timeframe of 48 hours - purge days are set to 30.