If the game refuses to open or crashes right away, start with verifying the integrity of game files through Steam: right-click the title in your library, go to Properties, then Local Files, and hit Verify. Corrupted or missing files are a common culprit. Also check that your GPU drivers are up to date — outdated drivers cause more launch failures than most people expect.
A spike in latency usually points to something between your machine and the game server. First, switch from Wi-Fi to a wired connection if possible — wireless adds inconsistency. Then open the console and type 'net_graph 1' to see real-time packet loss data. If loss is above 2–3%, the issue is likely your ISP routing or local network congestion. Restarting your router and closing background apps that use bandwidth often helps.
Errors like 'connection to server lost' right as a match begins usually mean the game server had trouble initializing your session. Wait 60 seconds and try reconnecting through the main menu. If it happens repeatedly, check Steam's server status page — regional servers occasionally go down for maintenance without prior notice.
If the in-game shop freezes or search returns nothing, it's almost always a UI rendering glitch. A full client restart clears it in most cases. If the problem persists, try lowering graphics settings — on weaker machines the UI and rendering compete for resources, and the shop is one of the first things to lag.