Ok. So I am not sure what cause the initial crash (even if it happened when waking from sleep), but after crashing enough times especially with apps running, your SD probably has corruption on it. I would, as tedious as this will be, backup your saves, license file and any games that you do not have backed up on your computer. Once you do that, reformat your SD and then move your files back. I would redownload the boot.dat file as well.
You can try to scan and repair the SD first, but imo it's better to just start with a freshly formatted SD. See if the issue persists.
EDIT: While I am not on 7.0.x, I have been using 2.6.1 since it's release and have no issues waking from sleep, launching games or my Switch crashing. My SD is formatted fat32 as well.