M33 - issues with Dirac to connect to M33 - why?

Hi. Greetings from Poland. I bought a new M33 and have it since Monday this week. Generally set up went OK - incl access to my NAS, access to internet, firmware BluOs upgrades via internet. BluOs app on my iPad (and android app on smartphone) - work flawless. But I have an issue with Dirac - I bought a full version, downloaded app to my PC (Windows10). I have Dell Alienware laptop and I operate on LAN network in my apartment. Both M33 and my laptop are in the same network, even connected to the same router/switch. But somehow I can't connect to M33 to run calibration - Dirac app sees my M33 in network environment but when I click M33 icon there - it take a few moments and then a message like in the right top corner pops-up (please see attachment). I have no idea why. Interestingly - yesterday in the evening my laptop connected 2-3 times to M33 but I had no time for calibration (I was only trying to see if finally I will make this connection) and I wanted to connect to M33 again today in the morning and still again issues on and on (I did factory reset on M33, I restarted unit a few times, I restarted my PC a few times, I even shut down electricity in my apartment to turn off any equipment incl internet modem/router to reset ... and no luck with Dirac app connection to M33). On the other hand - on my android smartphone a Dirac Live app can connect to M33 and I could run calibration (I actually did once to check and managed to create/upload a filter into M33) but I can't there upload microphone distortion file and I also can't upload NAD curve (right?)  as per this guide: https://support.nadelectronics.com/hc/en-us/articles/360011867634-How-to-perform-Dirac-Live-Calibration-on-NAD-products- .

Any ideas - what should I do. Why would my PC connect to M33 a few times and again for most of the time it just fails. Nothing else changes in the network environment, that's just odd behaviour - ?

thanks

Adam