Wifi FP2 disconnection

Since a number of weeks my FP2 disconnects after a minute from my wifi network . Sometimes I must restart wifi on FP2, other times I must restart FP2.
I update FP2: Fairphone OS 19.11.2.
some help please.

@Eugenio_Fasser Did you get this resolved? I have the same issue, although it was occurring before the update to OS 19.11.12.