The device worked fine for many weeks. Then I changed once the access to Internet from Mobile to WiFi (actually it was set to main = WAN, switch over to Mobile initially, which worked over weeks). Also the access via WiFi worked well, but after changing back to the old configuaration my notebook is losing connection to the device via WLan frequently. Nothing was changed on the notebook, updates were halted for the past weeks.
Any reason for this strange behavior ?