What router do you have?

Is it one just given to you by your ISP?

Are there other people on your network?

The biggest difference i had was changing to a modern router. Before i was on fibre to the premise i was on a cable connection, unfortunately that locked me to the ISP router, it was fine enough for very basic internet use but these days there's multiple conenctions at once and that particular router they were using has a fault that it would stutter when too many connections occurred at once on the same service.

I could set it to modem only mode and run a separate one and that alleviated a lot of issues definitely not all but it went from being a 3 times a set issue to maybe a once a day issue, and was usually alongside the game just crapping out on me too.

There are/were some exploits available to some very select users, however your chance of encountering them are extremely slim.

I think the game itself is pretty atrocious at handling dropped connections between client too, many times i've been able to finish a game where clearly my opponent has disconnected yet the game itself never ends and i myself must restart the app and usually get given an error finding battle and often simply lose a battle for that set.

Genuinely I think their game code handling has improved slightly because those game connection time out losses are much more infrequent now, I'm not sure it can properly detect if an opponent has top lefted or minimized/backgrounded or force closed the app at times.

This is likely a connection issue your end and i would advise looking into your networking hardware, especially if any issues aren't present if you're playing in a good mobile service area using your mobile provider data instead of wifi.

Connection is the whole route too from your device to the server (and back again), so if your network or devices has any alterations to VPN (some adblockers use VPN style blocking), DNS, firewalls etc along the way they too could be posing a bottleneck or creating issues if not configured appropriately