On Mon, Jan 22, 2018 at 06:45:57AM +0100, Enrico Mioso wrote:

Crash happening here also in the WL-330n3G device; unfortunately, no messages to report.
Regarding your hypothesis regardingthe firmware not being able to communicate a problem regarding it's inability to send frames: around when OpenWRT had 3.9.9 kernel, this device worked for weeks no stop with no issues I think.
And I don't think this is only a coicnidence. So I suspect, but it's only an impression, also because I know ... very very little about this, that at some point things worked.

I think FW was upgraded since 3.9 kernel as well. But this 
could be also problem how driver program the device registers,
not only FW problem.

Regards
Stanislaw