Hello everyone. Sorry for the wrong English. We have our two XA phones (F3111, 33.3.A.1.97, 1302-4691) It's just one of those bugs. After rebooting, RAM increases continuously until the phone decelerates and reboots itself and starts all over again. My phone software is a new, fix it Xperia Companion, but yet wrong.
Bad phone Android OS ram use ~ 1.2GB (4 hours runtime)

Kernel / Always running (100%) 866 MB
Caches / Always running (100%) 225 MB
Native Always running (100%) 163 MB
Good phone ~ 600-800 MB (up to 3-4 days runtime)

Kernel / Always running (100%) 408 MB
Caches / Always running (100%) 238 MB
Native Always running (100%) 190 MB
Can you help me?