Hi Alena,
I test this in both the browser and native on my iPhone.
It seems to be the exact same issue as michael has described above.
It works every time in the browser testing with no problems.
When testing on the iPhone, it works approximately 9 times out of 10, and the other one time just hangs with no errors.
It is hard to reproduce because it does not happen every time. After reading michaels problems above, i notice my app does the same thing. The first login (after not logging in for a few hours) seems to hang. Then if I close the app and reopen it, it seems to login fine and will login fine for quite a few logins after that. If I close the app and do not use it for a while (like during the night), when I wake up and test, the first test will not work again.
Here is the public link:
http://appery.io/app/mobile-frame?src...
You can try loging in with username "a" and password "a" and notice that the odd time it will not login passed the login page, and instead just hang.
Thanks!