Please fix crash on iPhone. Was working on my iPhone, but has stopped – Astrill VPN Client Review

I love this app and it seems to work fine on my iPad and my computer, but it keeps freezing on my iPhone. It's spends and spends and I can't even log out or close it. I have not been able to use it for several days on my iPhone. Same thing on my husband's android. I see the app hasn't been updated in a year. Please fix!
Review by *****123456 on Astrill VPN Client.