I am not asking for help, just reporting what I have done, may be that can be of help to someone?
This is what I did, it might render your installation useless, so be careful.
My volumio, running on an old Acer laptop, looses network connection frequently.
First I created a cronjob, using SSH terminal
and entered the following line at the end:
00 5 * * * root reboot
This makes volumio reboot at 05:00 in the morning.
This seemed to help, but still not stable.
I checked and found that Volumio is running on Debian Jessie, which is rather old…
I decided to upgrade from Jessie to Stretch, which is the next version, using this description (Debian Stretch to Buster) replacing the word buster in the source list with stretch.
I selected DEFAULT for all option during upgrade.
I have only used/tested net radio and spotify, no problems so far.
Other pluigins, and functionality can cause problems .
But it seems more stable.
*It is important to have proper backup if you try this. *
It can be tricky to roll back if you run into problems.