I have the same problem. I called Ebay tech support. I was told the Ebay Android App was a "limited app" and I had reached the limit. She suggested I switch from using the mobile app to classic Ebay. I assume this means going to Ebay through the browser. When I questioned her about why this was happening, I could hear laughter in her voice. She did not want to explain much. I've only had the app a month or so and used it maybe 30-50 times. I don't know what limit I reached. I tried re-installing it and it would not even allow me to log back in.
I am new to the smart phone world, this Samsung s3 being my first. I have to believe there is something more going on with the eBay app than she was letting on. Why would they want it to be limited?
One good thing about having this problem is that while searching for the solution, I found this forum.
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