YW.
Mqtt Hub uses the most, 36.15MB, but that’s normal for that app. So it seems not app memory useage related.
Maybe the Hue app. What if you disable it for a while, to see if it makes a difference?
(Hue app can transmit/receive lots of data)
And/Or disable the Fritzbox app for a while:
(I deactivated the Fritzbox app, its excessive polling, fills the logging of the FB and the ball calculates itself dark red)
About the System Average load graph, can you select a bigger timeframe, like 31 days?
