impossible to take group selfies

[AC Question]

It is a weird thing, but taking selfies with the front camera it's totally fine, the problem is when I take group selfies... as soon as I take the pic, the phone camera app restarts and doesn't take the pic, so i need to try again and again, but it won't take the pic... but if after that I use it to take a pic just me, it works...
It didn't happened before, and I don't know what could change...

Anybody has the same problem?
Any solution?

thanks in advance