When selling extra items, once the little gold bag loaded saying amt received, I hit the back button on my phone to return to the weapons area quickly. When it went back it also sold the 1 item I kept and Did Not credit the gold for the sale to my account!! Next problem with back button use I noticed was when I purchased 50 of Energy for 10 R Credits. When I hit the back button to re-engage in the Battle it auto purchased another 50 of energy without the opt out warning. Has anyone else noticed these problems?