Activity page no load and no show nothing

hello, on my website use wordpress 6.6.1 the activities page does not load, it does not work correctly sometimes you have to refresh the page even 3 or 4 times, what could be the cause and what could I do in this case, thank you!
My website is http://www.meets.ro
Page from activity https://www.meets.ro/activitate/
specifically, that the page has moments when it works well, but most of the time it doesn’t, and I don’t know the reason