Samsung Galaxy J7

[Indergone]

Many troubles come to my phone. Galery and others always unrespond. Restart. Lag.

 

[B. Diddy]

Welcome to Android Central! First, try wiping the cache partition: https://support.t-mobile.com/docs/DOC-30305

If that doesn't help, then see if the problems persist in Safe Mode: https://support.t-mobile.com/docs/DOC-30290

 

[Vlad Cyprus]

Were you gaming? Did it overheat? It's not a high end phone, don't expect same performance like Sony Xperia XZ