Dedicated server tickrate reduces and ping increases overtime

Hey guys,
I’m having a serious problem right now that I don’t seem to find a solution for it. So I hope you pros here can help me :frowning:
I’m making a multiplayer game with dedicated server. When we first join the game (with 5-6 players), all players have the lowest ping possible, with almost maximum packets in. However, the longer we play, the higher the latency we have, the less packets from server we receive (check the image, first one is when just join the server, second is end of the 30 mins game). What can be the cause for this ? 30 mins is obvs not long and 6 people is not many. Thank you everyone!