I just received my new a7r IVa and purchased these Sony SF-G Series TOUGH 300MB/s 128GB cards (2). They seem a little bit "tougher" (no pun intended) to insert in the a7r IVa, and when I inserted the first one in the SD card slot on the back of my iMac, it didn't make a very good connection. I had to kind of wiggle it to get it to stay mounted. Anyone else have any similar issues with these cards? I have several external USB/SD readers that I'll try next time.