Thank you very much for your kind answers, igortyhon and Ashley
However some browsers have similar rules about some features only being allowed in a user input event like a touch or click.
I think this was it... I had the links opening in new pages, sometimes blocked by some browsers (?)... When the user returned to my app, it seems that they needed to re-focus it with a first click (even on the share button) and then, click again for it to work.
Since the first click wasn´t working, my guess is that they started smashing the share button... you know, the harder you push the faster it´ll go . And yep, this is where I think the browsers started blocking it. Maybe, I don´t know, just asuming this user behaviour by trying to understand the comments.
Since this menu is on the first layout, I solved it by letting the links load in the same window. When the user goes back it just loads the game again, and starts fresh... this solved my problem :)
Not a technical solution, more a psychological one... but didn´t had any comments on this matter again.
Once again, thanks so much for your answers, and Ashley, I really hope I can thank you and your team enough for this wonderful software someday.
Wish you a great week, thanks again, JP