More RAM will definitely help. Even from 8 to 16 will be significant. Lag and freeze is one of the known issues with EFT but it has improved a lot since the past issues and now a days it is more prominent with lower spec users. I see you are gaming on a laptop so that could be also why. I also believe you might be having an overheating issue that causes thermal throttling. Which all explains why you have to restart every 2-3 games. RAM will help here but not fully. You need a gaming PC (as an ultimate fix).