I think that'd be treating the symptom, not the actual problem. Although it would be an OK band-aid whilst trying to work out what the problem is.
I recommend getting hold of FusionReactor and do some profiling on your memory usage. It's pretty much impossible to say anything useful beyond that, based on the info you're providing.
Another thing you could do is to get in touch with Charlie Arehart, who is the expert on dealing with these issues: http://www.carehart.org/consulting/.
--
Adam