Raise max_input_vars
Used for example with menus with many, many items or WooCommerce products that have a lot of variations
suhosin.post.max_totalname_length = 65535
max_input_vars = 30000
suhosin.request.max_vars = 30000
suhosin.post.max_array_index_length = 256
suhosin.request.max_totalname_length = 65535
suhosin.post.max_vars = 30000
suhosin.request.max_array_index_length = 256