Hey @VITOL,
I've started to play on mobile a whole lot more recently and encounter the same exact problem. You can't permanently get rid of the white box of death, but there are a couple of things I've done to live with it.
Always play with the home button at the bottom. Zoom out completely, so you can see all of your Pokemon and the Pokemon of your opponent. Move your finger accordingly to hit the Vortex Battle Button.
When the white box appears, act like that portion of the screen has been cut off, you can't use that area. You have to scroll down on the places where the page has actually loaded. The white box of death will go away after you reload the page, so after you've completed your battle reload the page.
Note: I use Google Chrome on an android. Good luck mate!