We have had someone else here in this forum who also had only 5 GB still available. His problems stopped after he freed up a healthy amount of storage.
Please bear in mind the term “sdcard” does not necessarily refer to an actual SD card that you inserted into the device. In Android’s file structure, “sdcard” often represents the built-in internal storage while an added SD card often goes by “sdcard1” or “externalsd” or similar.