If I use the app on android or my browser after a while missions stop spawning untill I refresh the website or the app. This makes it hard to play as every 20-30 mins I stop receiving calls, this has been happening for a while now so I am unsure what is causing this.
I've noticed that with the app it doesn't seem to generate calls as quickly and I never seem to hit that max call number. But as soon as I switch to the computer it's right back to being on cue and gets to the maximum pretty quickly.