I'd try a different browser mate. Also ensure you don't have lots of tabs open. And maybe try clear your cookies and browsing history so it's starting a fresh.
When it's happening on a PC, I need somebody to enter 'console' and run a code for me so it gives off a report, then give that to the developers. They can't replicate the problem (usual issue) and I can't either to be able to run the report myself. But we don't have 'console' on an iPad I don't think. It's part of the Chrome browser on a PC.
I can't replicate that. But I only have a 6+ and Macbook Pro. Both stay logged in.
That's a cookie issue. So we need to erase them on the problem device, close the browser fully, and open it up again and start again so it stores a new fresh cookie.