Hi and welcome back to the forum! Your website does indeed take a long time to load, which makes me suspect it’s pretty heavy and as such is more easily causing a strain on the servers, resulting in getting 502s or similar issues.
I can see you’re using both WooCommerce and Elementor, which are both very heavy plugins and are not recommended to be used on free hosting, especially combined, as they can reach its limits pretty easily and result in suspensions (or errors, as in your case).
The advice in a similar issue applies: