Canon 7D locks up with "Full PC" when controlled from Pi1

Hi,
I'm seeing the problem that my 7D (Mark 1) locks up when I do too many
consecutive gphoto2-calls in a short space of time. The message on the
7D-LCD-display is "Full PC". Once it's in that state, nothing works, and
the error is usually only cleared by power cycling the camera.

I'm only seeing the problem when the 7D is connected to a Raspberry. Tested
on Pi 1 (running the Pi variant of Debian 8.0), and also on a Pi Zero W
(running debian 9.4). Connected to a Mac, I can't replicate the problem.

gphoto2 --summary doesn't cause the problem, get-config (for example
gphoto2 --get-config iso) causes the problem. Calling gphoto in, say, less
than 3 second intervals, is very likely to cause the problem; with
intervals over 5s it happens much more seldom.

Versions in all cases: gphoto-version 2.5.17, libgphoto2 2.5.19,
libgphoto2_port 0.12.0

Any idea as to possible causes?

kind regards,
Dave

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