The driver experts I know are in Memphis, Speaker Services.
But it sounds like Zorro nailed it.
I talked to a Peavey expert here, and he says that is a smaller chinese sytem, and he thinks you are just pushing it too hard.
How are you using it?
There are two types of overlaod protection on it, with different reset times.
If you are running light loads, you may have some technical issues.
He is willing to help you find something larger if you want to upgrade.
What you have may be doing all it can.