Pinging a host turns purple every 2 mins

Hi,

I have this host - " 457005021wfm01.pacs.rm.dk" that I ping - which goes a bit nuts - it turns purple every 2 mins - even tho the host is up... Running fine on Xymon 4.3.5 but not on pre-4.3.0 - anyone know a fix to this? Or whats causing this?

green <!-- [flags:OrdAsTLe] --> Thu Jan  5 11:07:10 2012 conn ok
purple <!-- [flags:OrdAstLe] --> Thu Jan  5 11:09:20 2012 conn ok


Regards,

Carl Melgaard