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Please check if the problem still occurs, if the external antenna is activated. Even without an antenna connected, the short pigtail can bring improvements.
You can enable the antenna as following:
Code Block # Enable external antenna sudo revpi-config enable external-antenna # Reboot device sudo reboot # Try again to connect ...
Original discussion
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I have problems as soon as I activate both Ethernet and WLAN, and they are on the same networks, what can I do?
This may be a routing problem. Take a look at this part of Dirk's video tutorial where it is explained: