Can't connect my pix 4 mini with recent MP

Hi, I have a weird problem here, I have a pix4 mini with latest stable rover firmware (4.4). I can connect it to MP or QGC without problem by USB, but I can connect it by telem ports (via dragonlink or tcp) only with the 1.3.77 version of MP. With latest versions the download of params is very very slow (often get stuck on stat_runtime pram).
If I let it run enough time I can get all the params, but impossible to manage the WPs or modifiy the params.
But no problems with the old 1.3.77…

Thank you for your answers