Hi all!
Seems like most have the same problem. I to had bots just hovering, charging and not upgrading any belts or what so ever. Turns out I hade no storage available for the old belts etc.
You might not have the same issue but woth thinking about.
Allthough, I have an other problem that you might figure out.
I got maby 50 con.bots in the roboport area but just a few of the work?