No updates on my side, the reconnections still happen (OS v66).
Yes, in my case one or two times per hour. Very annoying.
As said in another thread, Fairphone will release a new OS version tomorrow. It is meant to solve issues with phone reboots and brings back calling functionality for some problematic carriers. And I put all my hope in, that this update will also fix the WiFi and some other issues.
Fingers crossed!