I've had this phone for 4 years (Xperia LT29i, 1GB RAM), so it's a little ancient, but I'd still like to get to the bottom of this. At some point during the day, it starts killing apps and shows that the amount of free RAM is close to zero. This persists until I reboot the phone. I've tried checking & killing running apps with this, but it doesn't show anything hogging the memory. Might it be that the ram module is physically corrupted? Thank you in advance for replies!