upgrading sd card from 4gb fat32 to 32gb fat32, white led flashes then it turns off. looked at the faq for answers, found no solution.

[CoolMe]

Thanks, the scan didn't find any error.
View attachment 356518
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 10.1 MByte/s
Reading speed: 18.5 MByte/s
H2testw v1.4

but I still get errors sometimes.

Ok, format it again and put your data back on it. At this point, you should try uninstalling the problematic games then installing them again (from a different source if you're DL'ing them from the internet).