I think I've found a solution for this problem and two more I had but I do not reported here.
After a internal flash format, all started working well. Now it suspends an resumes well and solves other issues.
Booxtor, perhaps your "couple of recharging cycles" were a internal flash format. BTW, I've not charged since received.
There can be another potential problem with microSD: if microSD has an internal problem (bad format, files bad FAT allocated) or simply it is broken (bad sectors), you can experience the same problem and strange others not described here.
BTW, I solved this by chance. I has trying to format external SD and used the Boox menu for that... I selected Format option, read it was internal one, want to select no but I pressed yes with my fingers like frankfurt sausages...
Now I do not know if Boox came with some boox or other stuff into internal SD disk.
