With any cooler, the first thing you need to do is fill it with water. Close the lid . Then tip it too it's side. If water comes out its letting air in. AIR KILLS ICE !-----> shit can it or return it for the haircut $$$ you spent buying it.
The first one I got rid was Igloo cheap plastic hinges & lid latch. The second one I now use to store my boat spare parts in,was a Icey-tek made with overseas junk.
RTIC should give you a good product for a decent price.
I have owned many brands over my 60 years of boating.
I was fortunate to get the best at
www.FrigidRigid.com when pricing was affordable. Only cooler made in the USA online only with top self stainless hardware and tight D recessed groved lid. Custom built in rubber corner feet (no deck scratching or slipping) give them a look and have a cooler that will last the life of your boating years.