The problem you're experiencing happened to me about 2 years ago, and I spent 30-40 days trying to fix it. I'm not sure if it's the same issue, but I’ve never been able to figure out what triggered it. There are hundreds of servers open, but the number of people I've encountered who have experienced this issue, including you, is just three. I still don’t understand what’s causing it.
If your issue is the same as mine, in the Castle Siege, the defending side is not affected at all. Only the attacking side begins to experience a 'Crash,' not a disconnect. If you’re experiencing a disconnect, your issue is different. You can move around the castle without encountering any problems, and everything starts suddenly during the battle hours, causing only the attacking side to experience this issue.
I know how frustrating unresolved problems on an active server can be, and I understand you. This is a special solution for me, which is why I don’t want to share the fix. To keep the solution private, I need to make adjustments without being observed. You don’t have to trust me right away—try to fix it yourself, and if you can’t, you can come to me as a last resort. (I AM NOT ASKING FOR MONEY UNDER ANY CIRCUMSTANCES.)
If you can prove that you have an active open game and don’t face any security issues, I can enter your server and fix the problem for you.