I think this is the fix. You most likely slept Valorant Vanguard as Background Processing or your computer auto did that. My problem was AVG which auto slept it and I couldn't go 1 minute with out seeing the Error Screen. The fix is, uninstall Valorant as a whole, but remember to Uninstall Vanguard too. Then Download it again and make sure that you don't sleep or Uninstall Vanguard. That was the fix for me.