My iPhone 4s keeps restarting randomly in recovery mode.

It does it especially when I'm texting. Sometimes, the sms app simply crashes, for no reasons and I can't receive nor send any. Then, when it reboots, it's in recovery mode and my computer doesn't detect it, even in DFU mode.

It does it probably around 3-4 times a day. It's really a bother when you need your phone.

I tried restoring it to factory settings a couple of time and it didn't change anything.

Help ?

Thank you 🙂