I exactly have the same kind of issue.
90% of the time, home & recent buttons are disabled.
So sad... I was really upset with the former device I had (JXD 7800b), and so far, apart some plastic noices when opening or closing the XD, I was quite happy with this one .
Same as other users: it happens at starting the GPDXD (64G/Legacy). And when it happens, connecting through USB to my computer doesn't show anything !
with virtual button at the bottom of the screen (app found on market), I can manage to "simulate" home/recent behaviour. But connection through USB is a real pain in the xx
Surely a SW issue, cutting the link "this button is doing this"... since the home/recent action are still possible through virtual buttons. But I cannot understand why this issue is linked to the USB one. This is quite strange...
I will investigate to remove some apps we have in common... just in case.
and, just to share the info with Olonas: I also bought my device at Gearbest, the 64G one, order the 18th of august. Maybe bad device series ?