Hi

It may be the case that your phone has got a bit clogged up with temporary files.

From the Android home screen, open the Settings app (typically a cogwheel icon), open Storage and select Cache to clear it.

I hope that this helps, but if not please come back here and we can look into a different solution for you.

I think not cause I often make a cleaning with a preinstalled app to have free space on my ram and my memory.