Hi AJ,
First, I am not intimately familiar with your wave, but I will share some experiences I have had with other products.
First, I would check to make sure that all of your heaters are working. Simply go to the electrical connections, remove power, disconnect each heater (I prefer one by one while checking) and measure continuity/resistance through each one. Find a known working one, write down the resistance, and check the rest. If any deviate more than about 10% from the known good heater, then you have a bad one. This can cause your issue, since the machine may have to compensate for a dead heater band.
If that does not work, then I would concentrate on any information for your PID settings. Sometimes, tightening up the variables when the heaters come on, or altering the percentages some will help, but this is only after a) I have found that someone was in there changing the initial values or 2) Using different wattage heater bands.
Hopefully, these will help you until someone with much more experience on your machine is able to offer a suggestion.
Dan
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