you'll need to go in llama/debug mode and do the following
symbol-table load SPRITZ
shell 1 1 spy
shell 1 1 spyStart
shell 1 1 spyReport
shell 1 1 spyReport
shell 1 1 spyStop
symbol-table unload
Do this when the CPU is high.
This will tell us the cause.
Also, if you only see the problem when logging is set to debug, then I would say do not set the level of logging so high unless you are trying to debug an issue.
Gilles.