I haven’t seen that issue, but you may want to verify that you have the latest version of the iXpand Base app on your phone, the latest version is 2.2.
Reboot your iPhone and try again. If you still see these errors make sure that you have space on your SD card within the base unit. To help transfer data from the SD card to your computer you can check out this article that is in the KB pages:
https://kb.sandisk.com/app/answers/detail/a_id/20356/kw/SDIB20N
Also you can reach out to Sandisk support for additional help : https://kb.sandisk.com/app/ask/
