Please fix crash on iPhone. Was working on my iPhone, but has stopped

I love this app and it seems to work fine on my iPad and my computer, but it keeps freezing on my iPhone. Its spends and spends and I cant even log out or close it. I have not been able to use it for several days on my iPhone. Same thing on my husbands android. I see the app hasnt been updated in a year. Please fix!

*****123456 about Astrill VPN Client, v2.1