Thank you Matthew. After some more digging and testing I came to the 
conclusion: It is not weewx itself that causes the issue, but the WMR300 
driver for some reason. I downgraded to weewx 3.5.0 and everything worked 
fine. After copying the WMR300 driver files I upgraded again to the latest 
version and the issue was present again until I copied the driver version 
0.10 to the location /usr/share/weewx/weewx/drivers.

So, after all, I have a working configuration :-) Thanks for your support

Regards,
Roland

Am Donnerstag, 27. Oktober 2016 23:32:09 UTC+2 schrieb vince:

> On Thursday, October 27, 2016 at 1:12:29 PM UTC-7, Roland Ehle wrote:
>>
>> Downgrade to python-usb 0.4.3 did not change the behavior. Clean install 
>> of Ubuntu 14.04.5 followed by a clean install of weewx 3.6.1 did not change 
>> the behavior. No I took a brand new Raspberry, put weewx on it, but I have 
>> exactly the same issue. In the past I was running my station on a Raspberry 
>> with weewx 3.5.0 successfully.
>>
>>
> At this point it's unclear to me if it's software or hardware, so I'd 
> suggest a clean Raspbian with weewx 3.5.0 on it to try to recreate the same 
> config you had when it last worked.
>

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