Every day there will be one device (Windows server) which is getting Free Space results from a totally different server for about 20 minutes.
Server1 Free space will show C drive=12GB free and this is true.
Server1 Free space will suddenly show C drive=39GB and E drive=129GB free and this is not true. Server1 does not even have an E drive.
then the results will go back to normal after 20 minutes, C drive=12GB and E drive=0GB free (because there is no E drive, so PRTG thinks it's gone missing!)
I searched around and found that another server (server2) has C drive=39GB and E drive= 129GB free.
So it looks like PRTG is displaying results for server1 from server2.
This is happening to random servers, different probes. Server1 is on one probe and it's getting results from server2 which is on another probe. So this problem is probe-agnostic.
There have been no IP changes or anything like that, and it's been happening to a random server every day at a random time.