I have the same issue.
I have like 4 games installed and when I install the next one it fail to start, then I think that maybe is a bad nsp so I downloaded some more (like 6) and all of them fail.
After that I make a new test uninstalling one that still work and then reinstall it again and it don't work.
After that I reformat the sd card and start over and non of then want to start.
I try again with another sd card to see if the sd card is damage but I have the same results can't start the games.
I also try to install on internal memory and have the same results.
I try to install the game from the sd card and have the same results.
I enter on recovery mode and used the "Recovery Factory Settings Without Deleting Save Data" and I have the same results.
My Setup:
- Switch 6.2
- SD Card SanDisk Ultra 200GB (10)
- ReiNX 2.0
- Gold Leaf, USB and install from SD Card
- Tinfoil (I try this one)
- Atmosphere 0.8.2 (I try this one)