No idea what brand truck you have, but all three "major manufacturers" use a different brand of 7 pin receptacle. Keystone uses "the lowest bid umbilical cable assembly" they can negotiate, so chances are very, VERY good that what's on your trailer isn't the same brand as what's on your truck.
While all 7 pin connectors are supposed to be "similar and functional with all other brands" that's not the situation "in the real world"....
Chances are very good that you've got a bit of corrosion, a loose or sloppy brass male/female connection point on a pin or multiple pins in your trailer end plug. I would focus on that because you said you've tried it in BOTH the receptacles on the truck with the same results....
First, inspect the trailer end for damage/worn connectors, clean them well to remove any corrosion or possible wet dirt, etc that might be shorting between pins. Then apply a quality di-electric grease to the pins to prevent any corrosion from developing.
Also, behind your bumper connector, you'll find the "plug where the in bed connector jumpers into the system. That plug sometimes gets loose and can corrode, so unplug it, clean the pins and apply di-electric grease there.
If these steps don't fix your issue, I'd consider a "name brand" 7 pin umbilical plug/cable and replace what's on the trailer. I did that about 7 years ago and haven't had a "TRAILER DISCONNECT" on the truck instrument panel since.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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