Kind of a known problem for GM brake controllers, could be a loose connection, bad relay, or somewhere where moisture is getting in. After crawling under mine from one end to the other more than once I finally ran a new "hot" wire from the plug under the dash to the plug at the rear under the bumper and got a regular brake control.
By running a new wire you are able to use the plug in feature on the new control. At least on mine that was true. Just trying to plug it in to the factory harness it wasn't working as I think the factory control was overriding the aftermarket one, if that makes sense to you.
I think the braking seems better with the aftermarket one than with the factory one, or at least on mine.
Not saying you won't find the problem but in my situation it started on rainy days and continually got worse, with and without trailer. Pulled every connection apart cleaned all contacts and put dialectic grease on all. Finally just bypassed factory and haven't had a problem since.
Hope this helps
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