Boosting 5G mobile signal with ORBI NBK752

Hi everyone,

 I am looking for advice on how to boost the 5G mobile reception signal on the ORBI 5G WiFi Mesh System, AX4200 (NBK752). I am very happy with the 5G network performance and I am primarily using it as backup to the FiberOptic connection now, so we are literally always on. What I have noticed though is that if the 5G signal is swinging up and down and it isn't very stable, the connection switches constantly between 5G, LTE and sometimes even 3G. I was wondering if anybody has tried external antennas, and what your experience was in terms of signal boosting... With external I am not meaning necessarily outdoor antennas, but rather something that can be attached to the router, and provide signal boosting

Thanks in advance for your feedback and for sharing your experience

Ciao

ANdreaT