A disk-I/O error has occurred.
Over 12hours later still getting a crash in Southsun Cove.
Two characters I can’t use. The others in other areas fine.
That’s not an issue within GW2. Probably, your hard disk has a problem. Probably data sectors are going defective. A replacement may help before your hard disk is failing completely.
Go to the website of the manufacturer of your hard disk and download the hard disk diagnosis tool from that website that is suited to your hard disk. Test your hard disk and act accordingly to the result of the test.