Guys, seems like the following registry tweak may help (though Microsoft says it is for Windows 10 Mobile)
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sdbus\Parameters]
"DisableUhsSupport"=dword:00000000
Please try it and post your results. After applying this tweak my Transcend 64Gb SDXC Card works way more stable (fingers crossed)
Just want to share my experiences:
I have a rooted X98 plus. Neved had any SD-card (mainly Samsung 128GB) problems until from one day to another the tablet didn’t recognize the sd-card anymore (both android and windows). I tried the registry patch and it worked in windows after a restart. Sadly not under android. Here it will only recognize the 128GB sdcard as 1.86GB sdcard with no content.
Looks like I have to stick with windows until I find a solution for android. Maybe a reflashing will fix it….