Comment # 2 on bug 1187439 from Stanislav Brabec

I just rebooted into 5.3.18-lp152.78-default, and indeed, the "cannot verify
signal voltage switch" message is present there as well. But I never seen
"error -110". (I have no Leap 15.2 logs any more, so I cannot say it for sure,
but I never experienced broken mmc.)
# dmesg | grep mmc
[    5.171881] mmc0: cannot verify signal voltage switch
[    5.285997] mmc0: new ultra high speed SDR104 SDXC card at address 59b4
[    5.289038] mmcblk0: mmc0:59b4 USD00 236 GiB 
[    5.305832]  mmcblk0: p1

I can test any of the kernels (15.2 or 15.3) for a longer time.