[Bug]: Device becomes unreachable Heltec & LILYGO about firmware HOT 3 CLOSED

Is the MQTT channel very active? About how many nodes are you seeing on your node list? Busy MQTT channels are know to overload these devices.

from firmware.

Power save mode settings are not on by default, if you did not set them, the device will not go to lite sleep as you're suspecting. The only thing that will turn off is the screen and it should not be that either. I believe mqtt is flooding the node with too many nodes. To work around this, I suggest using admin to be able to control your node from other nodes via the app.

from firmware.

Is the MQTT channel very active? About how many nodes are you seeing on your node list? Busy MQTT channels are know to overload these devices.

No it isn't. NodeDB is almost full or full, but there are like 30 nodes active at a time, sending maybe 1x msg/hour. It's not that.

Power save mode settings are not on by default, if you did not set them, the device will not go to lite sleep as you're suspecting. The only thing that will turn off is the screen and it should not be that either. I believe mqtt is flooding the node with too many nodes. To work around this, I suggest using admin to be able to control your node from other nodes via the app.

So, you're saying that settings like:
"Wait for Bluetooth duration"
"Light sleep duration"
"Minimum wake time"
are NOT active, unless "Enable power saving mode" is turned ON? Why aren't they greyed out then?

Like said above, MQTT doesn't have much traffic and nodes, it's not flooded. It's not that.

I still think it's related to some power saving "feature". Or... any other ideas?

from firmware.