Garry's Mod Networking bug/error

Hi all, recently while playing Garry’s Mod, my game started to lag, not in the common delay lag but rather everyone just froze there and stopped moving. The chat stopped working, the console stopped outputting any messages, and while mouse movement still works, I cannot move myself (WASD). Enabling net_graph shows this:

I’m really at a loss here, my internet works fine for everything else except for Garry’s Mod.