Consistent Speed Up Lag in FC25 Online Games

Also have this issue for months now on my PC. It used to be running great at first. I have a constant stable connection speed of 700mbps and the game (FC 25) still runs smoothly for 90% of the time, but then it lags for 20 seconds and speeds up at least once or twice EVERY match now and is becoming unplayable - I'm losing matches due to this and given that this is also probably the WORST FIFA/FC ever made, I don't want to invest in any more of these products. On top of these issues the gameplay is literally random and inconsistent, with the game deciding when a goal will be scored - not your skill.