Thanks a lot. This did the trick. Actually on the freshly bought FP3 for my mom, this issue only appeared AFTER the android 10 update, so following the “reset WLAN” workaround really helped instantly. Regarding stability, that might still be an issue, so I will keep a watch on that before I hand it over. At least, reconnecting automatically dramatically decreases the required attention
Additional info:
Checked again, working fine.
What happened: after android 10 upgrade, the wifi settings became unstable. Noticeable, after sleep & reboot WiFi did NOT reconnect automatically to the known network.
Adittional symptom:
Under Settings → Network and Internet → Wi-Fi → Wi-Fi preferences → Turn on Wi-Fi automatically
Changing that setting did not work (tested by reboot after changing it off and on again)
FIX:
Set back/reset the network settings ( System → Advanced → Reset options → reset WiFi, Bluetooth and mobile settings). Thanks Paul121, @ontheair and @Simon1 (just changes your arrows and spacing here
For me WiFi worked directly after fixing, throughout reboots and after sleep.
No additional changes were nessessary on the FP3 to restore stable WiFi access.
Setting up the Wi-Fi connection again, rebooting (several times again) and observing over the day showed no regression, seems to be stable now.
(android build no. 8901.3.A.0107.20210503, current patch levels and updates applied on 2021-05-30)