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I am looking for the download of the 19c 32bit Windows client. Does this exist? I only see a 64bit client available for download.
If it's not happening with all your customers, or at least all your customers performing a certain operation, it does not smell like a coding issue, but rather something in your infrastructure or networking. See https://www.reference.com/technology/504-gateway-timeout-mean-a3a1efcaf584ea22
I'm afraid a Java forum is probably not a good place to ask questions like this.
You need to put a network trace on the route, or more easily, start out with a trace route using the IP protocol and see where the congestion is. Does it happen every time or just some times? If it happens sometimes, that is a horrible problem to trace, you have to put a packet sniffer in the line and see what conditions are present when the problem manifests. I have had it as simple as a router or gateway needed to be rebooted, and happy day, the problem was fixed. On the other hand I've had to trace for weeks to finally get enough cases to form an opinion of what was happening and then take even longer tracing out options on what was the cause.
good luck,
Les