Test goes purple randomly

Hiya

I have got a custom script that goes purple randomly for less than 5 seconds. Could this be because hobbit is not getting a response in the interval it is expecting a response (in this case 30 min). I have a few time-consuming custom scripts that run and my suspicion is that they don't all complete in an allotted time so hobbit assumes there is no response. Any input on this?

This is what the html log says.

Date 					Status 	Duration
Wed Oct 22 21:28:37 2008 	green 	11:57:35
Wed Oct 22 21:28:37 2008 	purple 	none


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Regards
Wayne