I just recently started going through all my personal games this past Monday (long process. I have a lot.) and so far, out of 73 carts checked, I have two that are problematic. (There are 3 more carts I have that I know to be bad off but I'm not counting them as I already knew about them.)
I found one of them, SMT IV, before I revisited this thread and saw the addendum on the first post, so I had already started the cart fixer on that one. The second game I found, Mega Man Legacy Collection, I did attempt the home screen sleep mode theory on. I started it at about 5:20PM yesterday my time, and I just checked on it now right at 5:20PM today.
Unfortunately, it still failed verification... however, I think it did help. Yesterday it failed immediately, and today it actually started the countdown timer. I didn't see what percentage it actually made it through though.
Also, not sure if it would be relevant, but I did the sleep mode thing with an unmodded console as I was still using the modded ones to check carts. If I need to try it with a modded console I can do that instead... was just trying to not hold up a modded console so I could continue verifying my games haha.
I still have a lot of games to go through, but I did prioritize titles I've seen listed here and all of my copies of those titles verified no problem (PQ, smash, MK7, pokemon, fire emblem, yokai watch, etc) except for the Mega Man cart that was mentioned on the previous page. MM is actually the title that prompted me to check my games as we had a copy at my store come back stuck on the 3DS splash screen, and I managed to fix it for the customer using the cart fixer program after 3 runs of it.
That does make 2 different copies of MM that I've encountered in about a week and a halfs time though. Might be another title to watch a little more carefully.
Also, the SMT IV cart still fails verification after three runs of the fixer. I'm not opposed to either continuing to run the fixer on it as it does go all the way through the cart and DID show improvement, or I could try the sleep mode method instead. I'm a little more interested in fixing my SMT IV cartridge over MM to be honest haha.