Make a simple trick and you Will see is not a RMA Problem… put MEM -1000Mhz... I have Gigabyte too and the problem is the Thermal Pads are very poor.. you need to change them to be able to mine to +100Mhs...
I add a picture mining with lolMiner with the Gigabyte 3080...
Didn't understand what you meant by put MEM -1000 Mhz and how you are managing 100 MH/S, Please elaborate.