Android app

Since a couple of weeks the (Android) app is telling me every 5 seconds to keep practicing. I tried to solve the problem by removing it from my phone and install it again, but with no results. After a while my e-mail account was warning me that my account was hacked!? So now I'm afraid to install it again and that's a pitty, 'cause I used the app quite frequently.

Is this problem known to you and if so, do you have a solution to solve this problem?

With kind regards,
Jos Hoek
joshoek@ziggo.nl