I normally sort by % of total if I'm looking for a "busy" device or app. Since you say this is a ~weekly occurrence, my guess is that it may be memory related, and would suggest maybe doing an hourly check on the amount of free memory. This can be done manually using http://yourHubIP/hub/advanced/freeOSMemory or if you want to automate the check you could use the Hub Information Driver and a quick rule.
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