Odrive hanging Pi3

I have the following on a a PI3 with UB18. The PI3 hangs and crashes whenever doing basic odrive commands such as

while True:
pos = odrv0.axis0.encoder.shadow_count

from python3. I am using the provided USB cable. Any thoughts? I can switch to a embeded x86 Atom system and give that I try. But for robot work this should work on PI3/4 …

In [3]: odrv0.hw_version_variant
Out[3]: 24

In [4]: odrv0.fw_version_revision
Out[4]: 11

In [5]: odrv0.fw_version_minor
Out[5]: 4

In [6]: odrv0.fw_version_major
Out[6]: 0