some days ago i bet on under goals and wanted to make a cash out. My bet was €1 and the cash oout option offered my €0.88. I was sure I will be lost the entire bet if I didn't use the option so i accepted the loss and clicked on the button. You have to wait some seconds before the cash out going through and during this time the offer was changed to 0.90. I immediately clicked on the button again, but offer jumped to 0.92. I clicked on yes asap but the offer was 0.94. This game lasted a while, offer changed every time during the processing period and I clicked on the accept changes -yes button aswell. So I have tried to make a cash out at 0.96, at 0,98, at 1, at 1,02, at 1,04, at 1,06, at 1,08, at 1,10, at 1,13. After that offer they have cancelled offering the cash out option due to the nearly end of the e-FIFA game (both halves were 6 minutes long).
My suggestion is: implementing an option/button you can accept all the cash out changes.