following the new firmware I got myself a USB keyboard and all was working well. However i recently bought a innex controller and a USB adaptor. All seemed good but now i have noticed when i swap between games from the USB - sometimes - the USB icon disappears from the front screen. only way to get it back is to reboot. Happened several times now. Is this due to my USB hub (not powered) or the controller? The only other thing that is different is that i have add more games to my USB. Anyone else had this? any help appreciated
This might be being caused by USB power brownout. Some USB sticks pull a fair amount of power that exceeds the USB Port's ability to deliver. Some ports can sustain it for short periods, but if it's long enough the USB controller will often shut down the port for protection and it has to be reinitialized to turn it on. A lot of keyboards are famous for this when plugging them in while the device is on, but if you plug them in ahead of time, sometimes that resolves the issue as the port is reinitialized during boot. If you have a flash drive on the same port, the drive may try to pull too much current at the same time as the Keyboard for too long, and it may cause it to brown out again if the USB drive needs more power than is available. Controllers usually don't have this issue.
It sounds like you have a hub, and a controller and the USB drive attached to the same port? If so, try dedicating the drive to the other USB port, and leave the controller and keyboard on the hub on the other port and see what happens if you turn the C64 mini on with everything plugged in that way. If it goes away, it might be the hub + the controller + the keyboard all trying to pull too much at the same time. I have a small unpowered USB hub that I leave the controller and keyboard plugged into when I need it that seems to be fine, but your mileage will vary.