Are the problem games large games? 30gb+
I had a lot of pkgs on a USB drive which I used to install from but one day I kep getting errors when installing.
Turns out the USB drive had corrupted some games. It was mainly some of the larger games, the small ones were fine.
Maybe your PC HDD is corrupting the games when downloading or the USB drive is when copying them over.
Long story short, google PS4PKGVerifier_1.4.zip and download version 1.4 to check your PKGs.
Make sure the 'Integrity' part shows up green and says 'OK'
View attachment 241839
It would be a good idea to check the integrity of the pkg on both your PC and on the USB drive after you have copied it over before installing.
Also is your USB drive formatted as exFAT?.