I need a little help, sometimes the buttons of the method payment doesn't work, I can't find what is going on, in the most of the cases they work.
What I usually do is login via SSH then run these commands: php bin/magento cache:clean php bin/magento cache:flush php bin/magento setup:static-content:deploy
If that doesn't work, flush your browser cache or use a different one. It's also possible that large processing delays in Magento itself cause the JS not to completely load so checking for any bottlenecks is another step to take.
If you're using a CDN for your site, flush that as well.