That Arugula error definitely lines up with your listed issues. It’s known to cause random gameplay bugs like invisible bosses, doors not opening, etc., because it’s a general networking hiccup. Try This: Use a wired Ethernet connection and avoid Wi‑Fi. Restart your modem/router to reset your connection. Clear your PC cache and verify game files (you’ve done that—good). Run SFC and DISM scans in Windows to fix underlying system issues. Confirm NAT is open and UPnP is enabled. If nothing changes, try connecting via a different ISP or a mobile hotspot—if that works, your ISP may be throttling or having routing issues. Unfortunately, if none of this helps it’s likely an issue with your route to Bungie’s servers. In that case, the best step is to submit a Bungie Help request under “Networking Issues” and reference your specific code (ARUGULA) and details. Persistence may be needed since these can sometimes take longer to resolve behind the scenes.