xymongen and xymonnet erratic

Env: 4.3.0 beta3 on RHEL5

Over a 24 hour period, the xymonnet process spends about 1/3 of its time in purple status, and 2/3 in green.  This proportion holds true over a 7 day period too.  Xymongen is very similar, with ratios of about 1/4th in purple, 3/4ths in green.

When xymongen goes purple, the main web page stops updating, causing people to lose faith in the veracity of the data being reported, leading them to ignore xymon entirely. 

What log file(s) will be helpful?

Thanks!