Hey Letterzero,
Sorry to hear about your troubles… I wish I knew what was causing your issue.
Could you provide a few more details about your system? What generation of Xbox, where is your gave data saved(external/internal), and if you are using an external drive what type(ssd/hdd)?
Also, there are several other threads discussing this issue.
https://forums.funcom.com/t/dashboarding-on-singleplayer/78715
https://forums.funcom.com/t/cant-load-save-game/78092
As for transferring your save data to GPortal, I don’t believe it’s possible.
https://www.g-portal.us/forum/thread/895-transfer-save-data-to-a-new-server/#post3515