Problem of AM1808 USB0 communication abnormality

Hi,

We are using silicon rev2.1 AM1808.

The system is installed in indoor, but when temperature of ouside get colder, USB0 of AM1808 will stop.

So, I guess AM1808 errata Advisory 2.1.10 "USB0 PLL Mean Frequency Can Drift Across Large Temperature Swings"

matches to our USB problem.

From AM1808 errata Advisory 2.1.10, I understand as follow:

When the temperature swing large from the temperature when USB0 controller have been initialized,

PLL will be unstable and USB0 communication abnormality occurs because of that.

Is it correct?

And how large temperature swing range is it, which cause the PLL Drift?

best regards,

g.f.