Try this, may be it is your computer and not eBay, If NBN or ADSL turn off the computer and the router at the wall. Reboot the whole system. Run your anti-virus, such as McAfee, or Windows Defender, and do a full scan. Then clear all cookies, history and cached data.
Then turn off power for the computer and router and NBN equipment at the wall again.
After 5 minutes reboot. Then try to log on.
Next if using Windows 10, and hoping you have backed up to an external hard drive, which you should do at least once a week. Click on settings at the bottom right hand corner. Click All Settings, and first check for any new updates from there Click update and security.
