[Xymon] Rare shape in graphs.

Hi all, Recently I've included 2 new host to monitor in xymon but from time to time response times are quite high (2 o 3 seconds). Shape in graphs draws ups and downs in a very recognisable manner:

[image: Inline image 1] [image: Inline image 2]

Testing the host (a windows server) with telnet for hours (Perl script) doesn't shows this responses times (always fewer than 1 second). Does anyone knows where could be the problem? Is it a xymon server problem or it may be in the remote server? I think it is in the remote server but I couldn't demonstrate it and than curious graphs doesn't help clarifying it.