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Live app not working anymore

My web app just get live yesterday. Everything went well, I set up all the DNS parameters on OVH and Bubble but today, for no reason, the website was unaccessible.
Strange part is that I still have access from my computer connected to wifi and also from mobile. When I turn off wifi to get an access with 4G, it’s not working anymore. Also I tried from others computers and it’s the same.
It looks like the website is charging but way too slow then an error message is appearing.

Do you have any idea?
FYI, I cleaned up the database to make sure it was not heavy.

Thanks a lot for your help!