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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Have you tried another trailer with electric brakes to see if itoo has this issue with your truck?
The TBC pulses a random brake signal to the trailer. When it does not sense a electrical load from the brake magnets it thinks the trailer plug is not firmly seated. So this can mean the trailer can have wiring, ground, or brake issues, or there can be a wiring corrosion resistance concern with the truck. Cleaning the ground wire connection on hte trailer is quite often the issue.
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Hello again Chris here,