Why is uploading photos interrupted?

Question

Nginx

There are large photos whose weight is more than 5MB, when forming the page, I reduce them using image_filter. 20 photos are loaded on the page at once, and from time to time some pictures stop loading and an error occurs . What could be the reason for this?
image_filter resize - 350;
Failed to load resource: net::ERR_CONNECTION_RESET

Answer 1

timeouts
did not wait until he was given a cut
in general, the pictures should already be kept cut