wlan down after some hours not using Volumio

Rpi2 running most recent version of Volumio 2.285. Problem happened with previous version too (volumio-2.246).
DAC: IQaudio DAC+
Problem: after several hours of not using Volumio, wireless network drops. Volumio keeps running (I could connect my tv to the hdmi input and access the console). As far as I can see, the power management for the wireless USB adapter is disabled (TP-Link TL-WN725N).

I checked the logs using ‘sudo journalctl’. I’m not an expert but sequence looks like this:

1.- I shut down my wifi network (SSID: ‘MSL’)
2.- Volumio goes into hotspot mode and eventually disables wlan0
3.- when wifi network ‘MSL’ comes back, nothing happens since wireless adapter is down

From the console I was able to issue ‘ifconfig wlan0 up’ to have volumio wireless up and running (though in hotspot mode).
Any suggestion to fix this problem?

PS: Here you have the link to the logs logs.volumio.org/volumio/nsfHp80.html
Last time I was using Volumio was 14 Oct at 18:21h