For the last several months Lightroom will begin processing thumbnail previews of photos on my SD card, but at random times the import window will disappear. After 2-3 attempts the app itself crashes. At first I thought it was due to my SD card. It was nearing capacity and would take forever to bring up the previews. I bought a new SD card. Still does the same thing even though it's nearly empty. Next I thought the SD card reader could be the problem so I bought a new $40 reader. First time using it...same thing. The card and reader are fine because I can import into the iPad photos app with no problem. I was so happy when Adobe added the import direct to Lightroom feature a while back. Now I'm back to the annoying process of importing to Photos first, them bringing them into Lightroom, then going back and deleting them from Photos.
I feel like I'm back in 2018. If anyone has a fix to get me back to present day it would be GREATLY appreciated.