I had one replaced.
The culprit is the reverse light lense.
On my 2016- it had 2 screws holding it.
I ordered a replacement unit.
On the new one I received- it has 3- much better seal.
When you replace your Geeman, check for that.
If the other lamp has 2, take the lense off and seal it with some clear silicone before reinstalling.
I siliconed both of them- no moisture now.
Just a poor initial design on these new LED's.
"If you are going through hell..keep going"