every few minutes is a lot. havent been on nord for a few years but even when i was on them i dont remember getting drops that frequently. i suspect it is likely not an issue with qbit as many others use it without running into drops like that - including myself.
probably an issue with either nord or your isp. if you are on wifi, there are also some routeres with known issues when it comes to dropping wifi signal - but there’s too many different models and firmware versions to really guess this accurately without detailed info (and sometimes it only happens in specific versions of firmware on specific routers).
i get occasional drops on PIA but its usually after running for something like 3-7 days straight. i’m not using the official pia client app but instead download manual ovpn file configurations from pia and import them into generic client. under windows, you need the openvpn free community client for this. under linux, you can import them into networkmanager. iirc, nord has manual ovpn files too but they make you select a specific server and download 1 config file at a time.
alternately, if you setup wireguard that might also work better but haven’t tested myself