I don't know why this keeps happening, but everytime two or more bedrock players joins, they will disconnect after joining for 10 seconds or more. This happens very often.
This doesn't happen at all before we switched to Spigot, we were using PaperMC and then decided to go with Spigot since it's fairly better for performance. I don't really know if this is because we used Spigot or it's something else. I hope you guys can help me with this.